Extrinsic and intrinsic/ brachial plexus study

Extrinsic: Brachiocephalic n

cleidobrachialis

Red color

Motor to skeletal efferent- ventral root.

Blue color

Cutaneous sensory from skin and proprioception from thoracic limb afferent- dorsal root

Extrinsic: cranial pectoral

superficial pectoral m

Extrinsic: caudal pectoral n

deep pectoral m

Extrinsic: Thoracodorsal n

Latissimus dorsii m

Extrinsic: long thoracic n

Serratus ventralis m

Phrenic N (not part of the brachial plexus)

Motor nerve for diaphragm

originates from C5, C6, and C7

lateral thoracic n (not extrinsic m)

cutaneous trunci m

Intrinsic thoracic limb M innervated by brachial plexus:

Suprascapular n.

Just motor: Supraspinatous m and infraspinatous m.

C6 and C7

Intrinsic thoracic limb M innervated by brachial plexus:

Subscapular n.

Just motor: Subscapularis

C6 and C7

Intrinsic thoracic limb M innervated by brachial plexus:

musculocutaneous n

motor: Biceps bracialii, brachialis, corocobrachialis m.

Sensory: Medial aspect of the antebrachium

C6, C7, C8

Intrinsic thoracic limb M innervated by brachial plexus:

Axillary n.

Teres major, teres minor, deltoideous, and caudal scapula

Craniolateral shoulder, cranial antebrachium

C7 and C8

Intrinsic thoracic limb M innervated by brachial plexus:

Radial

Triceps, anconeus, tensor facia antebrachium, brachioradialis, all extensors, supinator and abductor pollicis longus m

Deep: Extensor mm. and supinator m of antebrachium

Sensory: cranial/ lateral antebrachium and medial dorsal manus

C7 C8 T1 and T2

Intrinsic thoracic limb M innervated by brachial plexus:

Median n.

Pronator teres, pronator quadratus, flexor carpi radialis, superficial and deep digital plexus

Palmer aspect of manus

C8 T1 and T2

Intrinsic thoracic limb M innervated by brachial plexus:

Ulnar n.

Flexor carpi ulnaris, DDF, interossei mm

Caudal aspect of antebrachium, palmar aspect of manus, lateral digit V

C8 T1 and T2