BNG-345: Lecture 15

The ShoulderAnatomyDisease

Final Friday Nov. 20, 8:30-10:30 AM

Learning Objectives

Identify the bones of the shoulderIdentify the ligaments of the shoulderIdentify the muscles and their main functions

The Shoulder JointBall and Socket JointIn shoulder region there are 3 joints:

Glenohumeral Joint (GH)Sternoclavicular Joint (SC)Acromioclavicular joint (AC)

Bones of Shoulder Girdle

Scapula

Humerus

Clavicle

Glenohumeral JointComprised of the rounded medial anterior surface of the humerus and the glenoid fossa

The shallow surface of the GH joint and the connective tissue at the joint allows the arm a large degree of motion

Sternoclavicular Joint

At the medial end of the clavicle and the manubrium, which is the top most portion of the sternum

Acromioclavicular Joint

Where the acromial process of the scapula meets the clavicle

Acromioclavicular Joint

Joint where the Acromiol process of scapula meets the clavicle

LigamentsGlenoid Labrum

Fibrocartilage rim around the glenoid cavityDeepens the shallow cavityContributes little to joint stability

MusclesThe deep muscle group that moves the shoulder are the rotator cuff muscles

primary function is to keep the head of the humerus in the glenoid fossahelp rotate the shoulder in many directions

Muscles

Bursa

Osteoarthritis

Learning Objectives

Identify the bones of the shoulderIdentify the ligaments of the shoulderIdentify the muscles and their main functions