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Flashcards in Dig System Deck (33):
1

List the organs, in order, that make up the alimentary canal and list the other organs of the digestive system.

Alimentary Canal:
1. oral cavity
2. fauces (gullet)
3. pharynx
4. esophagus
5. stomach
6. small intestine
7. large intestine

Other Digestive Organs:
1. teeth
2. tongue
3. salivary glands
4. pancreas
5. liver
6. gallbladder

*major glands = salivary glands, liver, pancreas

2

State the two major functions of the digestive system and subdivide the concept of nutrient intake into its separate processes.

1. Nutrient Intake

- Prehension: process of getting food materials into oral cavity

- Mastication: physical degradation of ingesta within the oral cavity (grinding and mashing of solid food materials with the teeth)

- Deglutition: physical process of swallowing

- Emulsification: initial breakdown of lipids where they are dispersed as tiny droplets within the ingesta

- Hydrolysis: chemical "de-polymerization" of proteins, carbs, lipids which releases their basic organic building blocks

- Absorption: physical passage of nutrients through mucosal lining of intestinal wall and into its cardiovascular capillaries (most nutrients) and lymphatic capillaries (fat micelles)

2. Solid Waste Elimination

- dehydration of non-absorbed ingesta to form feces which are removed by defecation

3

Name and state the composition of the four major layers of the walls of the tubular digestive organs and similarly identify the layers of the mucosa.

OBJECTIVE 2

Epithelium:

Epithelium in Mucosa- simple columnar or stratified squamous epithelium (depending on where you're at in body)

Epithelium in Serous Membrane - mesothelium (simple squamous)


Connective Tissue Proper:

C.T. Proper in Mucosa - lamina propria

Submucosa

Tunica Adventitia


Smooth Muscle Tissue:

In Mucosa - muscularis mucosae

Tunica Muscularis

1. Mucosa: innermost layer and surrounds the lumen

- epithelium: lines the lumen
*stratified squamous epithelium up till stomach (protective lining)
*from stomach down it's simple columnar epithelium (secretory/absorptive roles)

- lamina propria: layer of c.t. proper that surrounds and supports epithelium
*highly vascularized and serves a pathway for nerve fibers in mucosa
*contains lymphatic nodules

- muscularis mucosae: smooth muscle tissue that surrounds lamina propria
*causes mucosa in stomach and small intestine to have numerous folds which increase surface area

2. Submucosa: surrounds muscularis layer, highly vascularized

3. Tunica Muscularis: surrounds submucosa
*thick layer of smooth muscle tissue that is responsible for peristaltic and other movements of esophagus, stomach, and intestine
*longitudinal and circular layers are responsible for peristaltic motion

4. Serous Membrane: outermost layer of alimentary canal covered by c.t. proper and mesothelium (visceral peritoneum)

5. Tunica Adventitia: where organs aren't covered by serous membrane and mesothelium isn't present

(It's just the c.t. proper by itself)

4

Identify the boundaries of the oral cavity and its two major subdivisions.

- the upper and lower lips form the boundaries of the mouth

Major Subdivisions:
1. Oral Cavity Proper - bounded by teeth
2. Oral Vestibule - between lips or cheeks and the teeth

5

Define fauces and discuss its landmarks.

Fauces - tubular passageway that connects oral cavity to pharynx

Landmarks:

. superior wall = soft palate
. palatine uvula
. palatopharyngeal arches (posterior)
. palatoglossal arches (anterior)
. palatine tonsils

6

Sketch the superior (dorsal) surface of the body and apex of the tongue and label its major landmarks.

Root - posterior, attached to hyoid bone

Body - main, dorsal is where papillae are, has terminal groove (separates dorsum of tongue from root), and median groove (blind foramen to apex)

Apex - tip of tongue

Blind foramen - indentation in posterior half

Lingual Frenulum - fold of oral mucosa that attaches inferior aspect of tongue to floor of oral cavity

Sublingual Fold - ridges on side of frenulum

Sublingual caruncle - little bump at front of sublingual fold

7

Differentiate the six types of lingual papillae.

1. Filiform Papillae: most numerous, form light colored hair-like projections over dorsum of tongue

2. Conical Papillae: larger, located on posterior aspect of tongue

3. Fungiform Papillae: mushroom shaped and interspersed among filiform p. (2nd most numerous, form pink dots on tongues surface)

4. Lentiform papillae - less elevated but just like fungiform's

5. Vallate papillae - resembles large fungiforms, located near posterior aspect of oral cavity

6. Foliate papillae - edges of tongue near palatoglossal arches

*only fungiform and vallate have taste buds

8

State the permanent and deciduous human dental formulae.

Permanent: 2 [ I 2/2 C 1/1 P 2/2 M 3/3 ] = 32

Deciduous: 2 [ I 2/2 C 1/1 P 2/2 ] = 20

9

Sketch a tooth in a sagittal section and label its crown, neck, root, pulp cavity, enamel, dentin, cementum, periodontium, and dental alveoulus.

p. 599

Crown - visible portion

Neck - junction of the crown and root

Root - embedded portion

Pulp Cavity - hollow space filled with soft tissue termed dental pulp

*Enamel - covers crown, hardest substance in body, calcium salts

*Dentin - second most dense, deep to enamel and cementum

*Cementum - covers root of tooth, bone- like c.t. that periodontium attaches to

(* three mineralized substances forming a tooth)

Periodontium - c.t. proper that anchors each tooth in its socket

Dental Alveoulus - space that holds tooth

10

Name and differentiate the several surfaces of a given tooth.

1. Masticatory (occlusal) surface - faces opp. dental arch

2. Lingual Surface - surface of tooth adjacent to the tongue
* on superior teeth, lingual surface is sometimes called palatal surface

3. Vestibular Surface - oriented towards oral vestibule

4. Labial Surface - on incisors and canines

5. Buccal Surface - on premolars and molars

6. Approximate Surface - "dental floss" surface

. mesial - toward middle
. distal - toward back of mouth

11

Properly designate any tooth using anatomic nomenclature and the numerical (1-32) system.

pg. 601

12

State the ages by which a) the first deciduous teeth erupt, b) a full set of deciduous teeth is present, c) the first permanent teeth erupt, and d) all permanent teeth except the third molars have erupted.

*infants are edentulous (without teeth)

a) 6 mo.
b) 2 yrs.
c) 6 yrs.
d) 13 yrs.

*later erupt at 17 yrs. but some fail to erupt at all

13

State the official name for each of the following: front teeth, eye teeth, cuspids, bicuspids, wisdom teeth.

Front teeth - incisor teeth

Eye teeth - canine teeth

Cuspids - canine teeth

Bicuspids - premolar teeth

Wisdom teeth - molar teeth (last one on each side of arch)

14

Define pharynx and differentiate it's three parts.

Pharynx - connects fauces to esophagus and nasal cavity to the layrnx

1. Nasal part of the pharynx (nasopharynx)

2. Oral part of the pharynx (oropharynx)

3. Laryngeal part of the pharynx (laryngopharynx)

*there are 7 openings into/out of the pharynx

*separates ingesta from inspired air (puts them down the right tubes)

15

Name the three parts of the esophagus and indicate the composition of the tunica muscularis in the top, middle, and bottom thirds.

* esophagus is tubular organ that connects pharynx to stomach; moves bolus down via peristaltic movements in tunica muscularis

1. Cervical Part
2. Thoracic Part
3. Abdominal Part (once it goes through diaphragm)

Upper part = skeletal m.t.

Central part = mix of both skeletal and smooth m.t.

Lower part = smooth m.t.

16

Diagram and label the stomach.

pg. 605

Cardiac Part - where esophagus attaches (near heart)

Fundus - bulges to the left, directly contacts diaphragm

Body - large central portion

Pyloric part - funnel shaped terminal portion

Lesser/Greater curvatures of stomach

Gastric Folds - allow stretch in mucosa of stomach

17

Differentiate pylorus, pyloric ostium, pyloric sphincter muscle, pyloric canal, and pyloric part of the stomach.

* these 5 are collectively where the stomach meets the small intestine

1. Pylorus -junction of stomach w/ duodenum

2. Pyloric ostium (opening) - leads to pyloric canal

3. Pyloric sphincter m. - controls the entry of stomach contents into duodenum

4. Pyloric canal - canal leading from stomach to duodenum

5. Pyloric part of the stomach - funnel-shaped terminal portion

18

Name the three major cell types in the lining epithelium of the stomach and state the function of each.

1. Parietal Cells - secrete hydrochloric acid

2. Principal (chief) Cells - secrete pepsinogen

3. Mucus Producing Cells - secrete mucus to prevent the stomach from autodigestion

* HCl + Pepsinogen = Pepsin

- proteolytic enzyme which begins breakdown of proteins

19

List in order, the three main parts of the small intestine and schematically draw and label the landmarks of the duodenum.

*joins stomach to large intestine

1. Duodenum (12 in)

- descending duodenum receives accessory pancreatic ducts and hepatopancreatic ampulla

Parts: superior, descending, horizontal, ascending

Flexures: superior duodenal, inferior duodenal, duodenojejunal

Duodenal Papilla: Major (receives hepatopancreatic ampulla) and Minor (receives accessory pancreatic duct)

*only part that has submucosal glands
* shortest villi
* main role = hydrolysis


2. Jejunum (8 ft)

* medium length villi
* main role is hydrolysis and absorption

3. Ileum (12ft)

*joins large intestine via ileal papilla
*longest villi
*main role is absorption
* greatest number of lymphatic nodules

pg. 616

20

List the structural modifications found in the small intestine that increase the absorptive capacity.

*small intestine's main role is hydrolysis and absorption of most nutrients

Circular folds- allow stretching and increases surface area available for absorption

Intestinal Villi - projections of intestinal mucosa that increase the surface area to maximize absorption

Microvilli - comprise the lining epithelium (simple columnar epithelial cells), biggest impact on the surface area

21

Diagram and label the large intestine including its four major components and their various landmarks.

pg. 613

Cecum:
- has finger like projection = vermiform appendix (if infected = appendicitis)

Colon:
- 3 parts: ascending, transverse, descending
- 3 curved parts: right colic flexure, left colic flexure, and sigmoid colon

Rectum (6 in)
- part of large intestine
- will have taenia coli on its outside
- distention causes sensation relating to the need to defecate

Anal Canal (1 in)
- terminal passageway, opens at anus, expels feces
- internal anal sphincter m. in tunica muscularis

22

Differentiate the functional roles of the stomach, small intestine, and large intestine.

Stomach: stores ingesta and mixes it with acid and pepsin to begin digestion of proteins

Small Intestine: receives chyme from stomach, mixes it with pancreatic juice, bile, and intestinal secretions and is major organ of hydrolysis and absorption

Large Intestine: absorbs water and electrolytes to dehydrate unabsorbed chyme to form feces

23

State the approximate lengths of various parts of the alimentary canal.

Small Intestine: 21 ft (2.5 cm in diameter)

Large Intestine: 5-6 ft (5 cm in diameter)

Duodenum: 12 in

Jejunum: 8 ft

Ileum: 12 ft

24

Name the three major pairs of salivary glands, state where each pair is located, and indicate where the ducts from each open into the oral cavity.

1. Parotid Glands
- Location: below and anterior to ears
- Open: papilla of the parotid duct opposite of second superior molar tooth

2. Sublingual Glands
- Location: below the tongue on each side of the midline
- Open: ipsilateral sublingual caruncle as well as a number of small ducts posterior to it

3. Submandibular Glands

-Location: medial to left and right bodies of mandible
- Open: left and right sublingual caruncles with sublingual glands

* salivary glands produce weak amylase that breaks down starches into glucose
* parotid gland can be moved to eye to prevent dry eye (will water your eye if hungry)

25

Name the lobes of the liver and state where the gallbladder is located relative to them.

1. Right lobe - largest lobe

2. Left lobe - second largest

3. Caudate lobe - small, above and behind hepatic porta (where hepatic portal vein, proper hepatic artery, and common hepatic duct are located in hilar area)

4. Quadrate lobe - (four sided) front and bottom

*gallbladder is located between right lobe and quadrate lobe

26

Diagram and label a hepatic lobule and discuss the flow of blood and bile through it.

1. Hepatocytes (liver cells) are arranged around central veins to form functional units called hepatic lobules

2. Hepatic Triads are located at several loci around the periphery of each lobule (a triad consists of a branch of the proper hepatic artery, hepatic portal vein, and the biliary ductule

3. Blood flows from the proper hepatic artery and the hepatic portal vein through sinusoidal capillaries (spaces between hepatocytes)

4. These are the second capillaries in the hepatic portal system and allow hepatocytes to absorb metabolite and toxins

5. Blood from proper hepatic artery and hepatic portal vein flow CENTRALLY to central vein

27

Diagram and label a hepatic lobule and discuss the flow of blood and bile through it.

(continued)

6. central veins coalesce to form venous channels which empty into 3-4 hepatic veins

7. these leave the liver and drain into inferior vena cava

8. hepatocytes produce bile as an exocrine product (aids in emulsification, digestion, and absorption of lipids)

9. bile is secreted into biliary channels termed bile canaliculi

10. bile canaliculi carries bile peripherally to dump into biliary ductules within hepatic triads

11. these ductules empty into larger biliary channels which form R/L hepatic ducts

12. these then form the common hepatic duct which receives cystic duct and then continues to form bile duct

13. bile duct is joined by pancreatic duct to form the hepatopancreatic ampulla (opens at major duodenal papilla in small intestine)

28

Diagram and label the biliary duct system.

pg. 616

1. the gallbladder is a storage reservoir for bile secreted by the liver

2. the gallbladder consists of a fundus, body, and neck (connects to the cystic duct)

3. swells as it fills with bile and contracts via smooth m.t. in tunica muscularis to force bile back though cystic duct into bile duct and then into descending duodenum

4. the sphincter m. of the hepatopancreatic ampulla determines if bile is stored in gallbladder or continued into descending duodenum

- if relaxed bile continues into descending duodenum
- if contracted bile is forced into cystic duct and stored into gallbladder

29

List the three gross parts of the pancreas, name its two ducts, and indicate where each one terminates.

1. Head of the pancreas - widest part, near descending duodenum

2. Body of the pancreas - along horizontal part of duodenum (continues toward spleen)

3. Tail of the pancreas - left extremity

*Pancreatic Duct - this joints the bile duct to form the hepatopancreatic ampulla and empties into descending duodenum at MAJOR DUODENAL PAPILLA

*Accessory Pancreatic Duct - branches from the pancreatic duct and enters duodenum at MINOR DUODENAL PAPILLA

30

List the three main cell types present in the pancreas, state what each produces, and indicate which two are found in the pancreatic islets.

1. Pancreatic Acinar Cells - produces pancreatic juice (most important digestive fluid in the body)

* contains enzymes that hydrolyze proteins, carbs, and lipids

Pancreatic Islets - scattered among pancreatic acinar cells

contain:

2. Alpha Cells - produce glucAgon (A for glucagon)

3. Beta Cells - produce insulin

31

Differentiate abdomen, abdominal cavity, peritoneum, and peritoneal cavity.

Abdomen - region of the body below the thorax and above the pelvis

Abdominal Cavity - space within the abdomen and is continuous below with the space inside the pelvis

Peritoneum - serous membrane that lines the abdominal and pelvic cavities and the organs inside them

* visceral peritoneum - adherent to the surfaces of the organs

* parietal peritoneum - on the abdominal wall, pelvic wall, and on the underside of the diaphragm

Peritoneal Cavity - potential space between visceral and parietal peritoneum
- closed cavity (except for openings of the ovaries)

32

Define retroperitoneal and list several structures to which the term applies.

Retroperitoneal: "behind the peritoneum"
- peritoneum is only on anterior surface (one layer of visceral peritoneum)

includes:
- kidneys
- adrenal glands
- abdominal portions of the aorta and inferior vena cava

33

Define harelip, cleft palate, malocclusion, gingivitis, periodontal disease, peptic ulcers, enterotomy, appendicitis, hernia, perionitis.

Hairlip/ cleft palate - failure of left and right primordia to fuse properly during gestation

Malocclusion - improper tooth positioning; crowded oral cavity (cooked teeth)

Gingivitis - inflammation of the gums

Periodontal disease - problems of the gums and dental alveoli (related to poor oral hygiene)

Peptic ulcers - erosions of the mucosa of the stomach or duodenum due to HCl

Enterotomy - removal of offending object in the small intestine

Appendicitis - inflammation of the vermiform appendix , classic sign is severe abdominal pain

*McBurney's point - imaginary landmark located at one third the distance between the right anterior superior iliac spine and the umbilicus

Hernia - abnormal passageway which various organs may protrude and become strangulated

Perionitis - inflammation of the peritoneal membrane which lines the abdominal cavity