Understanding the peritoneal cavity Flashcards Preview

Theme 1: The Alimentary System > Understanding the peritoneal cavity > Flashcards

Flashcards in Understanding the peritoneal cavity Deck (32):
1

Endoderm forms

Majority of gut, including most of epithelium and glands of digestive tract

2

Mesoderm forms

Muscular layers

3

Ectoderm forms

Epithelium at extremities of tract (cranial and caudal)

4

The primitive gut

Formed as a result of two folds:
- cranial- caudal
- lateral- back to from

At 4 weeks the cranial and caudal ends are still closed by membranes:
- bucco- pharyngeal
- cloacal

5

Gut divisions

Foregut

Midgut

Hindgut

6

Foregut fate

Oesophagus

Stomach

Proximal hald duodenum

Liver

Pancreas

7

Midgut fate

Distal hald duodenum

Jejunum

Ileum

Cecum

Asc. + 3/4 transv colon

8

Hindgut fate

1/4 transv + desc + sigmoid colon and rectum

9

Peritoneum and mesentery

Mesentery formed by a double layer of peritoneum

Dorsal or ventral according to its relative position with respect to gut tube

10

Mesentery

Suspends gut organs

Pathway for blood, innervation, lymphatics etc to reach the gut

Ventral mesentery degenerates during development, except for foregut

11

Dorsal mesentery

Attaches gut organs to posterior abdominal wall

Gives rise to
- gastrosplenic ligament
- lienorenal ligament
- greater omentum
- mesentery of small and large intestine

12

Ventral mesentery

At foregut region only, it gives rise to
- ligaments around the liver
- falciform ligament
- lesser omentum

13

Lesser omentum

Attaches lesser curvature stomach to back of liver

Has a free edge

14

Abdomen

Trunk below diaphragm

Abdominal cavity occasionally called abdominopelvic

Greater pelvis is continuous with less pelvis

15

Abdomen wall (external)

Flat abdominal muscles

Lumbar vertebral column

16

External oblique

From: outer surface of lower eight ribs

To: linea alba, iliac crest, pubic tubercle

17

Internal oblique

From: lat 1/3 inguinal ligament and ant 2/3 of iliac crest

To: linea alba, costal margin, crest of pubic bone

18

Transverse abdominus

From: lat 1/3 inguinal ligaments, int surface lower 6 ribs, iliac crest

To: linea alba, crest of pubic bone

19

Rectus abdominis

From: pubic symphysis and crest

To: xiphoid process, 5th-7th costal cartilages

20

Blood supply/ drainage of muscle ant abd wall

Arteries: sup and inf epigastric, intercostal, circumflex iliac

Veins: thoracoepigastric

21

Innervation of muscles ant abd wall

Thoracoabdominal nerves

(also thoracic and subcostal nerves for rectus abdominis)

22

Function of external obliques

Work with int obl for torsional movement of trunk

23

Function of internal obliques

Flex and rotate trunk

Compress viscera

24

Function of transverse abdominals

Compress and support viscera

25

Function of rectus abdominals

Flexes trunk

Compress viscera

26

Lesser/ greater sacs

Formed as a result of organ rotation

Lesser sac behind stomach

Rest of peritoneal cavity- greater sac

Communicate via the epiploic foramen

27

Inguinal canal

Serves as passageway for the
- spermatic cord to reach the scrotum in male
- the round ligament of the uterus to reach the labia majora in female

Limited by the superficial and deep inguinal rings

For both genders the genital nerve and other blood and lymphatic vessels also travel through this canal

Considerably larger in males

28

Spermatic cord consists of

- vas deferens
- gonadal vessels
- nerves
- lymphatics
- the cremaster muscle

29

3 layers of the sleeve/ covering the spermatic cord takes as it passes through the abdominal wall

- transversalis fascia
- internal oblique
- external oblique

30

Transversalis fascia

Contributes the innermost covering of the spermatic cord

The internal spermatic fascia

31

Internal oblique

Contributes the middle covering layer to the cord

The cremasteric fascia

32

External oblique

Contributes the outer covering of the cord

The external spermatic fascia