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shoulder functional anatomy pt 3 - Coggle Diagram
shoulder functional anatomy pt 3
BM function of clavicle
strut bw shoulder girdle and axial skeleton
by maintaining UE away from midline clavicle improve BM efficiency of axiohumeral muscles (pec major and lats) -> muscles expend energy creating GH motion as opposed to pulling shoulder medially
subclavius:
-tendinous origin from first rib and inserts on inferior surface of middle 1/3 of clavicle
-innervation: nerve to subclavius (branch from sup trunk, C5/6 contributions
-functions to stabilize SC joint during strenuous activity
primary arterial supply to HH: ascending branch of anterior circumflex artery
-branch ascends at bicipital groove with long head of bicepsentering bone near articular margin
-remainder from post circumflex and branches within the RC tendon insertions
suprascapular nerve
-arises from branch of upper trunk of BP
-courses posteriorly to suprascapular notch with suprascapular artery. passes through notch deep to transverse scap lig, arterty passes over lig
-nerve then passes deep to SS which ir innervates then passes deep to spinoglenoid notch at base of spine and then continues deep to IS which it also innervates.
-nerve gives off articular sensory branches to AC and GH
can get compressed at spinoglenoid or suprascapular notches resulting post shoulder pain/weakness
neurovascular structure at greatest risk during anterior shoulder surgery: axillary nerve
-traverses posteriorly from posterior cord to innervate deltoid and TMi
-travels with post circumflex art. below inferior border of subscap and travels along IGHL
-Axillary nerve divides into 4 branches while passing through quadrangular space: motor to ant/post portion of deltoid, sensory (superior lateral brachial cutaneous nerve) and motor to TMi
CN XI: lies superficial in the post cervical triangle and is susceptible to injury
-innervates trapezius
-post cervical triangle border:
-anterior: SCM
-posterior: trap
inferior: clavicle
-may be injured iatrogenically
-most commonly injured during cervical lymph node biopsy or by direct trauma
-injury to spinal accessory nerve leads to drooping of shoulder, asymmetric neckline, pain, and weakness in elevation of arm
long thoracic nerve: innervates SA
-paralysis of SA leads to medial border winging
musculocutaneous nerve: terminal branch of lateral cord of BP
-C5,6,7
-penetrates and innervates coracobrachialis then travels into brachium b/w biceps and brachialis innervating both
-terminal sensory branches emerge b/w brachialis and brachioradialis and travels into forearm as lateral antebrachial cutaneous nerve
Brachial Plexus: provides sensory and motor innervation to UE and shoulder girdle
-C5-C8, T1
-Pg 327
-inconsistent innervation from C3/4
Robert Taylor Drinks Cold Beer
5 Roots: from ventral rami of C5-T1
3 trunks: superior, middle, and inferior
3 anterior and 3 posterior divisions
3 cords: medial, lateral, and posterior
terminal branches:
-musculocutaneous
-axillary
-radial
-median, ulnar roots