Neurology of the thoracic limb Flashcards Preview

week 4 - neurology and angiology of the forelimb > Neurology of the thoracic limb > Flashcards

Flashcards in Neurology of the thoracic limb Deck (25)
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1

What are the roots of the brachial plexus?

C6, C7, C8, T1 and T2

2

Route and connections of N. suprascapularis

- Enters the intermuscular space between m. supraspinatus ans m. subscapularis.

- Accompanied by the supraspinous artery and vein.

3

What does N. suprascapularis innervate?

- After passing over the scapular notch, innervates m. supraspinatus.

- Sends a small branck to the lateral part of the shoulder joint.

- Continues across the scapular neck to the end of the spine, where it innervates m. infraspinatus

4

Origin of Nn. subscapularis

- Usually a single, but occasionally double.

- Arises from the union of a branch from C6 nerve with C7 nerve.

- Divides into cranial and caudal part, before entering the medial surface of m. subscapularis.

- Only 5cm long. Allows extensive sliding movement in the shoulder.

5

What does Nn. subscapularis innervate?

m. subscapularis

6

What does N. axillaris innervate?

- The true flexors of the shoulder: m. teres major, m. teres minor and m. deltoideus.

- M. cleidobrachialis (which used to be the clavicular part of the deltoideus).

- Supplies a branch to the shoulder joint capsule.

- Gives off a cutaneus branch: n. cutaneus antebrachii cranialis

7

Route and connections of N. musculocutaneus

- From the brachial plexus runs towards the elbow joint on the caudo-medial surface of m. biceps brachii.

- Lies cranial to a. brachialis, n. medianus and n. ulnaris.

- Gives off a small branch at the shoulder joint to m. coracobrachialis.

- Distally to the shoulder, gives off r. muscularis proximalis to m. biceps brachii.

- Proximal to the elbow, gives off r. communicans to n. medianus.

- Distally gives off r. muscularis distalis to m. brachialis and a small branch to the elbow joint.

- Terminates as n. cutaneus antebrachii medialis.

8

Route and connections of N. radialis

- From the brachial plexus, it runs over the tendinous insertion of m. latissimus dorsi.

- Enters between caput mediale and caput longum of m. triceps brachii.

- Divides into two branches: superficial and deep

- Continues disto-laterally on the caudal and lateral surfaces of m. brachialis.

9

What does N. radialis innervate?

All extensors of the elbow, including the triceps and the anconeus

10

Route and connections of R. superficialis of N. radialis

- Appears at the cranio-ventral edge of the triceps' lateral head.

- Divides into two parts: lateralis and medialis

- The lateral branch gives off n. cutaneus antebrachii lateralis.

11

What does R. superficialis of N. radialis innervate?

The skin on the cranio-lateral, cranial and cranio-medial aspects of the antebrachium

12

Route and connections of R. profundus of N. radialis

- Runs beneath m. extensor carpi radialis and across the flexor surface of the elbow.

- Reaches the deep lateral aspect of the antebrachium by passing under m. supinator.

13

What does R. profundus of N. radialis innervate?

- All the extensors of the crpus and digits, including m. extensor carpi ulnaris (which is functionally a flexor)

- M. brachioradialis.

- M. supinator.

- M. abductor digiti I longus.

- Sends a small branch to the elbow joint's capsule.

14

Route and connections of N. medianus

- Innitially bound to n. ulnaris by fascia, but separates in the proximal brachium.

- Proximal to the elbow recieves the r. communicans from n. musculocutaneus.

- Distal to the elbow, passes beneath m. pronator teres.

- Runs between the superficial and deep digital flexors, accompanied by a. mediana.

15

What does N. medianus innervate?

- M. pronator teres.

- M. pronator quadratus.

- M. flexor carpi radialis.

- M. flexor digitorum superficialis.

- Parts of m. flexor digitorum profundus

- The elbow joint's capsule.

16

Route and connections of N. ulnaris

- Initially bound to the n. medianus by fascia, but separates from it in the proximal brachium.

- In the mid-brachium, gives off n. cutaneus antebrachii caudalis, which runs over the medial aspect of the olecranon and innervates the skin on the caudal antebrachium.

- Goes over the medial epicondyle.

- Runs between the superficial digital flexor and m. flexor carpi ulnaris caput ulnare.

17

What does N. ulnaris innervate?

- M. flexor carpi ulnaris.

- Parts of the deep digital flexor.

- Small branch supplied to the elbow joint's capsule.

18

Origin of N. suprascapularis

C6-C7

19

Origin of N. subscapularis

C6-C7

20

Origin of N. axillaris

C6-C8

21

Origin of N. musculocutaneus

C6-C8

22

Origin of N. radialis

C6-T2

23

Origin of N. medianus

C7-T1

24

Origin of N. ulnaris

C8-T2

25