SKELETAL SYSTEM: SHOULDERS AND ARMS

Learning Target #7

Shoulder Girdle

Composed of: Clavicle (2):

articulates with the sternum and scapula Also called the “collar

bone” Scapula (2):

articulates with clavicle and the humerus Also called the

“shoulder blades”

Clavicle

Scapula

Associated Structures of the Scapula

Acromion process: articulates with the clavicle

Coracoid process: site of attachment at the top of the shoulder for muscles of the arm

Glenoid cavity: socket that receives the head of the humerus

Spine of the scapula: site of attachment for muscles of the arm and back

Associated Structures of the Scapula

Acromion

process

Coracoid

process

Spine Glenoid cavity

Upper Appendages

Humerus (2): upper arm bone, articulates with the scapula, radius, and ulna

Radius (2): lower arm bone, articulates with the humerus, ulna, and carpals Thumb side of the forearm

Ulna (2): lower arm bone, articulates with the humerus, radius, and carpals Little finger side of the forearm

Upper Appendages

Ulna

Humerus

Radius

Associated Structures

Humerus: Head of the humerus articulates with

the glenoid cavity of the scapula Deltoid tuberosity location of

attachment for the deltoid muscle

Associated Structures

Radius: Head of the radius articulates with the humerus Radial tuberosity location of attachment for the

biceps muscle Styloid process articulates with the carpals to

form the wrist Ulna:

Olecranon process articulate with the humerus, forms the elbow joint

Coronoid process grips the humerus from the inside of the arm

Associated Structures

Head of the

humerus

Deltoid tuberosit

y

Head of the

radius

Radial tuberos

ity

Styloid process

Coronoid process

Olecranon process

Upper Extremities

Carpals: wrist, 8 bones per hand Metacarpals: palm, 5 bones per hand,

heads of these are the knuckles Phalanges: fingers, 14 bones per hand

Upper Extremities

Distal

Middle

Proximal

Phalanges

Metacarpals

Carpals