Intro to Muscles and Nerves Flashcards Preview

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Flashcards in Intro to Muscles and Nerves Deck (37):
1

How many joints does the Biceps Brachii cross ?

2 joints

2

How many joints does the Brachioradialis cross ?

1 joints

3

When does the diaphragm ascend and descend ?

Descend on contraction and ascend on relaxation

4

What muscles does the rotator cuff comprise of ?

Supraspinatous muscle
Subscapularis muscle
Teres minor muscle
Infraspinatous muscle

5

What separates the muscles into the anterior and posterior compartments ?

Intermuscular septum

6

What types of muscles are found in the anterior compartment ?

Flexors

7

What types of muscles are found in the posterior compartment ?

Extensors

8

What are ligaments and tendons made of ?

Dense regular fibrous tissue

9

What does a ligament attach to ?

Bone to bone (to stabilize a joint)

10

What does a tendon attach to ?

Muscle to bone (found at the end of a joint)

11

What region do the nerves supplying the forearm muscles originate ?

The cervical neck region

12

What are the spinal nerve roots of the brachial plexus ?

C5-T1

13

What are the spinal nerve roots of the sacrolumbar plexus ?

L1-S4

14

What is the name of the flat tendon which covers each layer of the abdominal muscles ? and what is its function ?

Aponeurosis
Absorbs the energy when muscles are stretched or contracted

15

Which two bones does the sternomastoid muscle attach to inferiorly?

Clavicle and sternum

16

Which bone does the sternomastoid muscle attach to superiorly ?

Mastoid process

17

What kind of nerves emerge from the dorsal root ?

sensory neurons

18

What kinds of nerves emerge from the ventral root ?

Motor neurons

19

What is present shortly after the dorsal root ?

Dorsal root ganglion

20

What kind of neurons are present in the dorsal ramus ?

Mixed motor and sensory

21

What kind of neurons are present in the ventral ramus ?

Mixed motor and sensory

22

What muscles does the dorsal ramus feed ?

The skeletal muscles of the back and the sensory back receptors

23

What muscles does the ventral ramus feed ?

The sensory receptors of the limbs and trunk and the skeletal muscles of the limbs and trunk

24

What part of the spinal cord/spinal nerves supplies the motor input to the erector spinae and the sensory input to the skin on the back ?

Dorsal Ramus

25

What part of the spinal cord/spinal nerves supplies the motor input to the intercostal and abdominal muscles and sensory input to the skin overlying these muscles ?

The ventral ramus

26

What is the name of the nerves that supply the intercostal muscles ?

The intercostal nerves (derived from the ventral ramus)

27

Where does the nerve that supplies the intercostal muscles lie ?

Below the rib of the same number
(12 ribs therefore 12 intercostal nerves)

28

What intercostal nerves also supply the muscles of the anterior abdominal wall ?

The 6 lower intercostal nerves (T7-T12)

29

What is a dermatome ?

An area of the skin supplied by nerves from a single spinal root

30

What joint occurs in the midline of the trunk at dermatome T2 ?

The sternal angle

31

What surface features of the body are found t dermatome T4 ?

The nipples

32

What surface feature of the body marks the dermatome T10 ?

The umbilicus

33

What is myelin ?

A fatty white sheath that surrounds the axon of some nerves cells forming an electrical insulating layer

34

What is the name of the layer that surrounds the myelin sheath in an axon ?

Endoneurium

35

What is the name of the layer that surrounds the bundle of axons to create a fasciculus ?

Perineurium

36

What is the name of the layer around the entire group or bundles of fasciculus that create a nerve ?

Epineurium

37

What's the name of the cell that surrounds individual axons ?

Schwann cells