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40 Cards in this Set
- Front
- Back
Brachial plexus is formed by nerves........ |
C6-T2 (sometimes C5) |
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3 types of innervation of thoracic limb |
motor innervation to skeletal muscles
cutaneous sensory innervation from the skin
proprioception from muscles & tendons |
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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. |
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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' |
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At the brachial region, the RADIAL N. provides... |
motor to:
-triceps brachii m. -tensor fasciae antebrachii m. -anconeus m. |
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What happens to the radial n. after providing to muscles in the brachial region? |
Divides into DEEP & SUPERFICIAL BRANCHES |
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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.
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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 |
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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) |
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Communicating br. of musculocutaneous nerve joins with ___________, carrying sensory from the ____________ |
a) median n. b) palmar aspect of the manus
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Nerve dysfunction of SUPRASCAPULAR N. causes |
-reduced shoulder jt. extension -atrophy of muscles... -shortened stride
*contracture of infraspinatus m.: lameness
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Nerve dysfunction of SUBSCAPULAR N. causes |
-no marked change in gait |
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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 |
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Musculocutaneous n. receives sensory from which OVERLAP ZONE? |
palmar aspect of the manus |
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AXILLARY N. receives sensory from... |
1. cranial lateral cutaneous brachial n. -AUTONOMOUS ZONE
2. Cranial cutaneous antebrachial n. |
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AXILLARY N. dysfunction causes....
how do we test it? |
-reduced shoulder jt. flexion -atrophy of deltoideus m.; prominent acromion
-lateral surface of shoulder |
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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) |
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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)
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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
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MEDIAN N. receives sensory from: |
palmar aspect of the manus
*no AZ |
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Dysfunction of the MEDIAN N. causes |
reduced flexion of carpus & digits |
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in the brachial region, ULNAR N. gives rise to.. ....and what does it do? |
-caudal cutaneous antebrachial n. -receives sensory from caudal antebrachium (AZ) |
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In proximal antebrachial region, ULNAR N. provides motor innervation to... |
-flexor carpi ulnaris m. (ulnar & humeral heads)
-deep digital flexor m. (ulnar & humeral heads) |
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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)
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Dysfunction of ULNAR N. causes... |
-reduced flexion of carpus & digits
-reduced sensory: -caudal antebrachium -lateral aspect of manus
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Blue? |
Axillary n.
-cranial lateral cutaneous brachial n. |
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Green? |
Musculocutaneous n.
-medial cutaneous antebrachial n. |
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Purple? |
Ulnar n.
-Caudal cutaneous antebrachial n. -->caudal antebrachium
-Dorsal br. of ulnar n.-->lateral aspect of manus |
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Brown? |
Radial n. -Superficial br. -Medial br. --medial aspect of manus -Lateral br. --dorsum of manus -lateral cutaneous antebrachial n. -->lateral antebrachium |
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white? |
Median, musculocutaneous & ulnar nn.
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purple? |
Ulnar n., dorsal br. |
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lateral red? |
radial n., medial br. |
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dorsum? |
radial n. lateral br.
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Testing for sensation in DORSAL BR. OF C6 SPINAL N. ......if sensation absent? Present w/ affected brachial plexus?
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1. Rootlet avulsion: C6-T2 spinal roots torn - no AZ for C7-T1
2. Brachial plexus trauma or avulsion |
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Axillary n. |
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Median n. |
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Median n. |
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Musculocutaneous n. |
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Subscapular n. |
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Suprascapular n. |