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PIMA BIO130

CHP8 Skeletal; Upper Extremity Bones and Their Markings

QuestionAnswer
Clavicle Collar bones; the shoulder girdle is joined to the axial skeleton by articulation of the clavicles with the sternum (the scapula does not form a joint aitht he axial skeleton)
Scapula Shoulder blades; the scapulae and clavicles together make up the shoulder girdle
Superior border Upper margin
Medial (vertebral) border Margin toward the vertebral column
Lateral (axillary) border Lateral margin, toward armpit or axilla
Spine Sharp ridge running diagonally across the posterior surface of the shoulder blade
Acromion Slightly flaring projection at the lateral end of the scapular spine; may be felt at the tip of the shoulder; articulates with the clavicle
Coracoid process Projection on the anterior surface from the upper border of the bone; may be felt in the groove between the deltoid and pectoralis major muscles, about 1 inch below the clavicle
Glenoid cavity Arm socket
Humerus Long bone of the upper part of the arm
Head (re: humerus) Smooth, hemispherical enlargement at the proximal end of the humerus
Anatomical neck (re: humerus) Oblique groove just below the head
Greater tubercle (re: humerus) Rounded projection lateral to the head on the anterior surface
Lesser tubercle (re: humerus) Prominent projection on the anterior surface just below the anatomical neck
Intertubercular groove (re: humerus) Deep groove between the greater and lesser tubercles; the long tendon of the biceps muscle lodges here
Surgical neck (re: humerus) Region just below the tubercles; so named because of its liability to fracture
Deltoid tuberosity(re: humerus) V-shaped, rough area about midway down the shaft where the deltoid muscle inserts
Radial groove(re: humerus) groove running obliquely downward from the deltoid tuberosity; lodges the radial nerve
Epicondyles (medial and laterl) (re: humerus) Rough projections at both sides of the distal end
Capitulum (re: humerus) Rounded knob below the lateral epicondyle; articulates with the radius; sometimes called the radial head of the humerus
Trochlea (re: humerus) Projection with a deep depression through the center similar to the shape of a pulley; articulates with the ulna
Olecranon fossa (re: humerus) Depression on the posterior surface just above the trochlea; receives the olecranon process of the ulna when the lower part of the arm extends
Coronoid fossa (re: humerus) Depression on the anterior surface above the trochlea; receives the coronoid process of the ulna in flexion of the lower part of the arm
Radius Bone of the thumb side of the forearm
Head (re: radius) Disk-shaped process forming the proximal end of the radius; articulates with the capitulum of the humerus and with the radial notch of the ulna
Radial tuberosity (re: radius) Roughened projection on the ulnar side, a short distance below the head; the biceps muscle inserts here
Styloid process (re: radius) Protuberance at the distal end on the lateral surface (with the forearm in the anatomical position)
Ulna Bone of the little finger side of the forearm; longer than the radius
Olecranon process (re: ulna) Elbow
Coronoid process (re: ulna) Projection on the anterior surface of the proximal end of the ulna; the trochlea of the humerus fits snuggly between the olecranon and the coronoid processes
Trochlear notch (re: ulna) Curved notch between the olecranon and coronoid process into which the trochlea fits; also called semilunar notch
Radial notch (re: ulna) Curved notch lateral and inferior to the semilunar notch; the head of the radius fits into this concavity
Head (re: ulna) Rounded process at the distal end; does not articulate with the wrist bones but with the fibrocartilaginous disk
Styloid process (re: ulna) Sharp protuberance at the distal end; can be seen from outside on the posterior surface
Carpal bones Wrist bones; arranged in two rows at the proximal end of the hand; proximal row (from the little finger to thumb)- pisiform, triquetrum, lunate, and schapoid; distal row- hamate, capitate, trapezoid, and trapezium
Metacarpal Bones Long bones forming the framework of the palm of the hand; numbered (from medial side) I, II, III, IV, V
Phalanges Minature long bones of the fingers, three (proximal, middle, distal) in each finger, two (proximal, distal) in each thumb; numbered (from medial side) I (except first middle), II, III, IV, V
Created by: Jgiron6994