Muscles of Shoulder Girdle Attaching Scapula to Spine

Question 1

Upper Trap

Answer 1

PA: med 1/3 superior nuchal line, ext. occipital protuberance, lig nuchae, SP C7

DA: post border lat 1/3 clavicle

Inn:Motor: accessory n. (CN 11)
Sensory: Branches from ventral rami (C3,4)

Actions: Open Chain(OC)‐ upward rotation; Closed Chain (CC) - Unilaterally: ipsilateral SB, contralateral. Rot head and neck

Question 2

Middle Trap

Answer 2

PA: SP T1‐6 & supraspinous ligs

DA: med border acromion & sup lip of spine of scapula

Inn: Motor: accessory n. (CN 11)
Sensory: Branches from ventral rami (C3,4)

Actions: OC - scapular retraction & ER

Question 3

Lower Trap

Answer 3

PA: SP T7‐12 & supraspinous ligs

DA: triangular area med to base of spine of scapula

Inn: Motor: accessory n. (CN 11)
Sensory: Branches from ventral rami (C3,4)

Actions: OC - scapular upward rotation & downward slide

Question 4

Rhomboid Major

Answer 4

PA: SP T2‐5

DA: Medial border of scapula between root of spine & inferior border

Innervation: Dorsal scapular nerve (C4,5)

Actions: scapular retraction, ER & downward rot.; Assists with upper slide

Question 5

Rhomboid Minor

Answer 5

PA: SP C7 & T1 & lower lig nuchae

DA: Medial border of scapula at level of root of spine

Innervation: Dorsal scapular nerve (C4,5)

Actions: scapular retraction, ER & downward rot.; Assists with upper slide

Question 6

Levator Scapula

Answer 6

PA: TP C1‐4, & post tubercles of TP C3,4

DA: Med border scapula between sup angle and root of spine

Innervation: Dorsal scapular nerve (C5) & branch of (C3,4) spinal Nerves

Actions: OC‐ downward rot. the scapula
CC‐ ipsilateral SB & rot. of the neck

Question 7

Latissimus Dorsi

Answer 7

PA: T7‐12 SP, lumbar SP, median sacral crest, supraspinous ligs, and post iliac crest via the post layer thoracolumbar fascia, outer lip of post iliac crest lat to erector spinae, muscular slips to ribs 9‐12

DA: Floor of bicipital groove

Innervation: Thoracodorsal nerve (C6,7,8) (aka as long or middle subscapular n.)

Actions: OC‐ adducts, extends, & IR of humerus, assists with scapular depression; CC‐ trunk elevation