Pectoral Girdle and Upper Limb Correne Reyes, Summer Abiad, Jordan Kolb

GET READY FOR THE MOST HUMERUS PRESENTATION YOU WILL EVER SEE

Pectoral Girdle MAIN COMPONENTS: 1. Scapula (shoulder blades) 2. Clavicle (collar bones) Movements of the clavicle and scapula position the shoulder joint and provide a base for arm movement Important as sites for muscle attachment

Clavicle Connects the trunk to the upper limb by extending from the manubrium of the sternum to the acromion of the scapula Supports the humerus and scapula and maintains their position relative to the rib cage

The smooth superior surface of the clavicle lies just beneath the skin. The rough inferior surface of the acromial end is marked by prominent lines and tubercles, attachment sites for muscles and ligaments.

Scapula Large, flat, triangular bone that connects the clavicle to the humerus

GLENOID CAVITY: Shallow and cup- shaped on the head of the scapula which joins with the head of the humerus

SUBSCAPULAR FOSSA: The depression in the anterior surface of the body of the scapula Subscapularis muscle attaches here and to the humerus

Acromion: larger posterior process that extend over the glenoid cavity Scapular spine: divides the posterior surface of the scapula into 2 regions: Supraspinous fossa Infraspinous fossa

Upper Limb What we know generally as our arm, forearm, wrist, and hand MAIN COMPONENTS: 1.The Humerus (one bone that extends from scapula to elbow) 2.Radius and Ulna 3.Wrist and Hand

The Humerus

Head

Greater Tubercle: forms the lateral shape of the shoulder

Lesser Tubercle: Lies more anteriorly, separated from greater tubercle by an intertubercular groove

Anatomical Neck: Lies between tubercles and below surface of head Surgical Neck is where the bone grows. It is a common fracture site

Deltoid Tuberosity: attaches to deltoid muscle. Runs along lateral border of shaft

At the distal end of the humerus, the shaft flattens and forms a triangle between the Medial Epicondyle, Lateral epicondyle, and condyle provide additional surface area for muscle attachment.

Trochlea: large medial portion shaped like a pulley. Coronoid fossa- anterior olecranon fossa- posterior These accept projections from the ulna when you move your elbow

Capitulum- forms lateral region of condyle Radial Fossa- prosimal to capitulum and accepts projection from radius

Radius (lateral aka thumb side) Ulna(pinky side). Ulna provides medial support of forearm

Olecranon of ulna is point of elbow. Trochlear notch Coronoid Process

Radial Notch- accommodates head of radius Styloid process of ulna Styloid process of radius- only the radius involved with wrist joint. It prevents lateral movement of carpal bones

Radial Tuberosity: narrow neck where biceps barchii attach to radius Radial notch- disc shaped head of radius that articulates with humerus and ulna

Bones of Wrist and Hand

4 Proximal carpal bones: Scaphoid Bone, Lunate Bone, Triquetrum bone, pisiform bone

4 distal carpal bones: trapezium, trapazoid, capitate, hamate

5 metacarpal bones form palm of hand

Each hand has 14 phalangeal bones. Fingers have the proximal, middle, and distal phalanges.

LETS PLAY A GAME

Works Cited 2/22/Pectoral_girdle_front_diagram.svg/250px- Pectoral_girdle_front_diagram.svg.png Textbook. N.p., n.d. Web. 18 Nov Essentials of Anatomy and Physiology. N.p.: Pearson, Print. ptYSSRMtI/AAAAAAAAAFM/9QLtuJhssc0/s1600/pectoral+girdle.jpg N.p., n.d. Web. 18 Nov /jpg/labeled_humerus.jpg. N.p., n.d. Web. 18 Nov mlWeb. 18 Nov