ANAT1012

Median Nerve: What does it innervate? which spinal cord segments does it arise from?

Anterior Forearm: All except those innervated by the ulnar nerve (Flexor Carpi ulnaris + half of flexor digotorum profundus) Hand: intrinsic thenar muscles (C5) C6-T1

Brachial Plexus? Which spinal cord segments?

C5 to T1 The ventral rami emerge between middle and anterior scalene.

Lateral Pectoral Nerve: Innervates what? Arises from which cord?

Clavicular Head of pec Major. Arises from the lateral cord

Musculocutaneous Nerve: What does it innervate? which spinal cord segments does it arise from?

Coracobrachialis + biceps brachii + brachioradialis C5,6,7

Cords of the Brachial Plexus? Which branch arises from these cords? Nerves coming from each cord?

Cords arise from the infraclavicular Branch. Posterior Cord: - Axillary - C5,6 - Radial - C5-C8 (T1) - Upper subscapular - C5,6 - Thoracodorsal C6,7,8 - Lower subscapular C5,6 Lateral Cord: - Lateral Pectoral - Musculocutaneous - C5,6,7 Medial Cord: - Medial Pectoral - Medial Brachial cutaneous - Medial Antebrachial cutaneous - Ulnar (C7)C8,T1) Arise from median and lateral cord - Median (C5)C6-T1

Axillary Nerve: What does it innervate? which spinal cord segments does it arise from?

Deltoids + teres minor C5,6

Ulnar Nerve: What does it innervate? which spinal cord segments does it arise from?

Flexor Carpi ulnaris + half of flexor digotorum profundus (C7) C8-T1

Throacodorsal Nerve: What does it innervate? which spinal cord segments does it arise from?

Latissimus Dorsi C6,7 and 8

Radial Nerve: What does it innervate? which spinal cord segments does it arise from?

Posterier arm and posterior forearm (all muscles) ELBOW, WRIST AND GHJ EXTENSORS. Arise from C5-8(T1)

Dorsal Scapular Nerve: What does it innervate? which spinal cord segments does it arise from?

Rhomboids + levator scapulae C5 ventral rami (pierces middle scalene)

Long thoracic nerve: What does it innervate? which spinal cord segments does it arise from?

Serratus anterior From C5,6 and 7 ventral rami

Medial Pectoral Nerve: Innervates what? Arises from which cord?

Sternal head of pec Major and pec minor. Arises from the medial cord

Subclavian Nerve: Innervates what?

Subclavius

Upper Subscapular Nerve: What does it innervate? which spinal cord segments does it arise from?

Subscapularis C5,6

Lower Subscapular Nerve: What does it innervate? which spinal cord segments does it arise from?

Subscapularis + teres major C5,6

Branches of the Brachial Plexus?

Supraclavicular and infraclavicular. Supraclavicular branches arise from the roots (2 nerves) and trunks (1 nerve) of the brachial plexus Infraclavicular branches arise from the cords

Suprascapular Nerve: What does it innervate? which spinal cord segments does it arise from?

Supraspinatus + infraspinatus Arises from the superior trunk. The superior trunk forms the merging of the C5 and C6 ventral rami, therefore the suprascapular nerve carries C5 and C6 axons.

Roots of the brachial plexus

The roots of the brachial plexus are the ventral rami of C5-T1 as opposed to nerve roots that arise from the spinal cord.

Main form of stability in the GHJ?

gains its stability from muscles through range, and ligaments at the end of range. Rotator cuff muscles, deltoids.

Main form of stability in humeroulnar and humeroradial joints?

the humeroulnar & humeroradial joints gain stability mainly from bony architecture & ligamentous reinforcement. Some muscle action's help to stabilise the joints. This is unlike the glenohumeral joint, which gains its stability from muscles through range, and ligaments at the end of range.