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Musculoskeletal Assessment Exam 1
Shoulder Girdle, Brachial Plexus, Origins and Insertions, Ch 1-5
16
Anatomy
Graduate
09/28/2011

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Term
Pectoralis major
Definition
Origin:
-Medial 2/3 of clavicle
-Sternum
-Costal Cartilage 1-6

Insertion:
-intertubercular groove of humerus

Action:
-Adduction and Medial rotation of arm
-flexion and extension of arm

INNERVATION:
-Medial and Lateral pectoral nerves
Term
Pectoralis minor
Definition
ORIGIN:
-Ribs 3-6

INSERTION:
-coracoid process of scapula

ACTION:
-Depression of shoulder
-downward rotation of scapula

INNERVATION:
-medial pectoral nerve
Term
Sternocleidomastoid
Definition
Origin:
-sternum
-muscular head from clavicle

INSERTION:
-mastoid process of scull

ACTION:
-flexion of neck toward same side

INNERVATION:
-accessory nerve (cranial nerve XI)
Term
Subclavius
Definition
ORIGIN:
-rib 1

INSERTION:
-inferior surface of clavicle

ACTION:
-possible depresses clavicle
-maintains sternoclavicular joint

INNERVATION:
-nerve to subclavius
Term
Trapezius
Definition
ORIGIN:
-External occipital protuberance
-ligamentum nuchae
-spinous processes of C7 and all of thoracic vertebrae

INSERTION:
-spine of scapula
-lateral clavicle
-acromion

ACTION:
-elevation, retraction, and depression of scapula
-rotation of glenoid cavity upward

INNERVATION:
-accessory nerve (C3 and C4 sensory)
Term
Latissimus dorsi
Definition
ORIGIN:
-spinous process of lower 6 T, and all of L and S vertebrae.
-post iliac crest

INSERTION:
-intertubercular groove of humerus

ACTION:
--extension, adduction, and medial rotation of arm

INNERVATION:
-thoracodorsal nerve
Term
Levator scapulae
Definition
ORGIN:
-transverse process of upper 4 C vert

INSERTION:
-Sup ang and med border of scapula

ACTION:
-elevation of scapula

INNERVATION:
-C3 and C4
-dorsal scalpula nerve
Term
Rhomboid minor
Definition
ORIGIN:
-ligamentum nuchae
-spinous processes of C7 and T1

INSERTION:
Med border of Scapula

ACTION:
-elevation and retraction of scapula
-downward rotation of glenoid cavity

INNERVATION:
-dorsal scapular nerve
Term
Rhomboid Major
Definition
ORIGIN:
-spinous processes of T2 - T5

INSERTION:
-med border of scapula below rhomboid minor

ACTION:
-elevation and retraction of scapula
-downward rotation of glenoid cavity

INNERVATION:
-dorsal scapular nerve
Term
Serratus anterior
Definition
ORIGIN:
-ribs 1-8 on thoracic wall

INSERTION:
-scapula

ACTION:
-protraction of scapula
-upward rotation of glenoid cavity
-holds medial border against thoracic wall

INNERVATION:
-Long thoracic nerve
Term
Deltoid
Definition
ORIGIN:
-lateral third of clavicle
-acromion
-spine of scapula

INSERTION:
-deltoid tuberosity on shaft of humerus

ACTION:
abduction (middle head)
-flexion and medial rotation (anterior fibers)
-extension and lat rotation (posterior head)

INNERVATION:
-axillary nerve
Term
Supraspinatus
Definition
ORIGIN:
-supraspinous fossa of scapula

INSERTION:
-greater tubercle of humerus

ACTION:
-abduction of arm

INNERVATION:
-suprascapular nerve
Term
Infraspinatus
Definition
ORIGIN:
-infraspinous fossa of scapula

INSERTION:
-greater tubercle of humerus below supraspinatus

ACTION:
-lateral rotation of arm

INNERVATION:
-SUPRASCAPULAR NERVE
Term
Teres minor
Definition
ORIGIN:
-upper 2/3 of lateral border of SCAPULA

INSERTION:
-greater tubercle of humerus below infraspinatus

ACTION:
-lateral rotation of arm

INNERVATIOIN:
-axillary nerve
Term
Teres major
Definition
ORIGIN:
-medial lip of intertubercular groove of humerus

ACTION:
-adduction
-medial rotational
-extension of arm

INNERVATION:
-lower subscapular nerve
Term
Subscapularis
Definition
Origin:
-subscapular fossa of scapula

INSERTION:
-lesser tubercle and crest of humerus

ACTION:
-medial rotation of arm

INNERVAITON:
-upper and lower subscapular nerve
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