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Sternocleidomastoid

Sternocleidomastoid Action
Neck Flexion Contralateral rotation of head
Sternocleidomastoid Origin
Clavicular head - sternal end of clavicle.
Sternal Head - manubrium
Sternocleidomastoid Insertion
mastoid process
Sternocleidomastoid Innervation
CN XI & (C2-C3)
Scalenes (anterior, middle, posterior)

Scalenes action
*Elevates ribs
Flexion & lateral flexion of the neck, Contralateral rotation of head (anterior only).
*Ipsilateral rotation (mid & posterior)
Scalenes Origin
Transverse and costal processes C2-C7
Scalenes insertion
Superior surface of first 2 ribs
Scalenes innervation
Cervical Spinal Nerves
Subclavius

Subclavius action
*Depression
*Protraction
Subclavius origin
1st Rib
Subclavius insertion
Clavicle (inferior border)
Subclavius innervation
Nerve to Subclavius
(C5-C6)
Pectoralis Minor

Pectoralis Minor action
*Depression
*Protraction
*Downward rotation
*Elevates ribs
Pectoralis Minor origin
Ribs 3-5
Pectoralis Minor insertion
Coracoid process
Pectoralis Minor innervation
Medial Pectoral nerve (C8, T1)
Pectoralis Major

Pectoralis Major action
*Flexion of shoulder
*Adduction of shoulder
*Internal rotation of shoulder
Pectoralis Major origin
Ribs 2-6, Sternum, Infero-medial portion of clavicle
Pectoralis Major insertion
Greater tubercle & lateral lip of bicipital groove
Pectoralis Major innervation
Pectoral nerve (C5-T1)
Anterior Deltoid

Anterior Deltoid action
*Abduction of shoulder
*Flexion of shoulder
*Internal rotation of shoulder
Anterior Deltoid origin
Clavicle and scapula
Anterior Deltoid insertion
Deltoid tuberosity
Anterior Deltoid innervation
Axillary nerve (C5-C6)