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40 Cards in this Set

  • Front
  • Back

Brachial plexus is formed by nerves........

C6-T2 (sometimes C5)

3 types of innervation of thoracic limb

motor innervation to skeletal muscles



cutaneous sensory innervation from the skin



proprioception from muscles & tendons

nerves of the brachial plexus that innervate EXTRINSIC thoracic limb muscles



hint: superficial pectoral m., latissimus dorsi m., deep pectoral m., deep pectoral/cutaneous trunci mm.

Cranial pectoral nn.



Thoracodorsal n.



Caudal pectoral nn.



Lateral thoracic n.

Nerves of the brachial plexus that innervate intrinsic thoracic limb muscles

SS MARMU



SS= 'cranial part'


MAR= 'middle part', each is cranial/middle/caudal, respectively


MU= 'caudal part'

At the brachial region, the RADIAL N. provides...

motor to:



-triceps brachii m.


-tensor fasciae antebrachii m.


-anconeus m.

What happens to the radial n. after providing to muscles in the brachial region?

Divides into DEEP & SUPERFICIAL BRANCHES

The DEEP BRANCH OF the RADIAL N. provides ...

motor to:


-Brachioradialis m.


-Supinator m.


-Extensor carpi radialis m.


-Common digital extensor m.


-Lateral digital extensor m.


-Ulnaris lateralis m.


-Abductor pollicis longus m.


SUPERFICIAL BR. of RADIAL N. provides ...

Medial br. of superfical radial n.:


-sensory: cranial aspect of antebrachium


-sensory: medial aspect of manus



Lateral br. of superficial radial n.:


-sensory: craniolateral aspect of antebrachium


-sensory: dorsal aspect of manus


-Lateral cutaneous antebrachial n.


-sensory: lateral antebrachium

What are the autonomous zones of the RADIAL N.?

-Medial aspect of manus (medial br. superficial)



-Dorsal aspect of manus (lateral br. superficial)



-Lateral antebrachium (lat. cutaneous


antebrachial)

Communicating br. of musculocutaneous nerve joins with ___________, carrying sensory from the ____________

a) median n.


b) palmar aspect of the manus


Nerve dysfunction of SUPRASCAPULAR N. causes

-reduced shoulder jt. extension


-atrophy of muscles...


-shortened stride



*contracture of infraspinatus m.: lameness


Nerve dysfunction of SUBSCAPULAR N. causes

-no marked change in gait

Dysfunction of MUSCULOCUTANEOUS N. causes



How is sensory testing performed??

-reduced flexion of the elbow jt.


-loss of bicipital reflex



*test medial aspect of antebrachium

Musculocutaneous n. receives sensory from which OVERLAP ZONE?

palmar aspect of the manus

AXILLARY N. receives sensory from...

1. cranial lateral cutaneous brachial n.


-AUTONOMOUS ZONE



2. Cranial cutaneous antebrachial n.

AXILLARY N. dysfunction causes....



how do we test it?

-reduced shoulder jt. flexion


-atrophy of deltoideus m.; prominent acromion



-lateral surface of shoulder

Medial br. of superficial radial n. ...



...is found where?


...receives sensory info from....

-medial to the cephalic v.



...from


a) cranial aspect of the antebrachium


b) medial aspect of the manus (AZ)

Lateral br. of superficial radial n. ...



...is found where?


...receives sensory from?

-courses lateral to the cephalic v.



-craniolateral aspect of the antebrachium


-dorsal aspect of manus (AZ)


-LATERAL CUTANEOUS ANTEBRACHIAL N.


-SENSORY FROM LATERAL ANTEBRACHIUM (AZ)


Dysfunction of the RADIAL N. causes...

(above triceps):


-reduced extension of elbow/carpus/digits


-limb can't support weight


-dropped elbow


-walking on dorsum of manus


-loss of tricipital relfex


-atrophy of triceps brachii m.


(high and low damage):


-reduced sensation over dorsal manus & craniolateral aspect of forearm


MEDIAN N. receives sensory from:

palmar aspect of the manus



*no AZ

Dysfunction of the MEDIAN N. causes

reduced flexion of carpus & digits

in the brachial region, ULNAR N. gives rise to..


....and what does it do?

-caudal cutaneous antebrachial n.


-receives sensory from caudal antebrachium (AZ)

In proximal antebrachial region, ULNAR N. provides motor innervation to...

-flexor carpi ulnaris m. (ulnar & humeral heads)



-deep digital flexor m. (ulnar & humeral heads)

In mid-antebrachial region, ULNAR N. becomes...



....does what?

-Dorsal br. of ulnar n.


-sensory to lateral aspect of manus (abaxial


surface of digit 5) = AZ



-Palmar br. of ulnar n.


-motor to interossei mm.


-sensory to palmar manus (OZ)


Dysfunction of ULNAR N. causes...

-reduced flexion of carpus & digits



-reduced sensory:


-caudal antebrachium


-lateral aspect of manus


Blue?

Blue?

Axillary n.



-cranial lateral cutaneous brachial n.

Green?

Green?

Musculocutaneous n.



-medial cutaneous antebrachial n.

Purple?

Purple?

Ulnar n.



-Caudal cutaneous antebrachial n.


-->caudal antebrachium



-Dorsal br. of ulnar n.-->lateral aspect of manus

Brown?

Brown?

Radial n.


-Superficial br.


-Medial br. --medial aspect of manus


-Lateral br. --dorsum of manus


-lateral cutaneous antebrachial n.


-->lateral antebrachium

  white?

white?

Median, musculocutaneous & ulnar nn.


purple?

purple?

Ulnar n., dorsal br.

lateral red?

lateral red?

radial n., medial br.

dorsum?

dorsum?

radial n. lateral br.


Testing for sensation in DORSAL BR. OF C6 SPINAL N. ......if sensation absent? Present w/ affected brachial plexus?


1. Rootlet avulsion: C6-T2 spinal roots torn


- no AZ for C7-T1



2. Brachial plexus trauma or avulsion

Axillary n.

Median n.

Median n.

Musculocutaneous n.

Subscapular n.

Suprascapular n.