Muscle O/I and innveration for pectoral girdle

Question 1

Pec Major

Answer 1

'O' = Clavicle and sternum
'I' = Lateral lip of the intertubercular groove

Nerve = Lat and Med pectoral nerve

Question 2

Pec Minor

Answer 2

'O' = Ribs 3-5
'I' = Caracoid process

Nerve = C5

Question 3

Serratus anterior

Answer 3

'O' = Ribs 1-8 or 9
'I' = Medial border of scapula

Nerve = Long thoracic nerve

Question 4

Trapezius

Answer 4

‘O” = Sup nuchal line, ext. occipital potuberance, ligamentum nuchae down to T12

‘I’ = Anatomical horseshoe (spinous process, acromion, clavicle)

Nerve = Accessory nerve (CN XI)

Question 5

Levator scapulae

Answer 5

'O' = C1-4 Transverse process
'I' = Superior aspect of medial border of scapula

Nerve = Dorsal scapular nerve

Question 6

Rhomboid minor and major

Answer 6

Minor;
‘O’ = Spinous process of C7, T1
‘I’ = Medial border of scapula

Major
‘O’ = T2-T5 Spinous process
‘I’ = Medial border of scapula

Nerve = Dorsal scapular nerve

Question 7

Lat dorsi

Answer 7

'O' = T7-S5 spinous process
'I' = Floor of intertubercular groove (anterior humerous)

Nerve = Thoracodorsal nerve