Appendicular Skeletal System Appendicular Skeletal System Composed of

Appendicular Skeletal System

Appendicular Skeletal System • Composed of 126 bones • The appendicular skeleton is divided into six major regions: • 1) Pectoral Girdles (4 bones) - Left and right Clavicle (2) and Scapula (2). • 2) Arm and Forearm (6 bones) - Left and right Humerus (2) (Arm), Ulna (2) and Radius (2) (Fore Arm). • 3) Hands (58 bones) - Left and right Carpal (16) (wrist), Metacarpal (10), Proximal phalanges (10), Middle phalanges (8), distal phalanges (10), and sesamoid (4). • 4) Pelvis (2 bones) - Left and right ilium (2). • 5) Thigh and leg (8 bones) - Femur (2) (thigh), Tibia (2), and Fibia (2) (leg). • 6) Feet (48) - Tarsals (14) (ankle), Metatarsals (10), Proximal phalanges (10), middle phalanges (8), distal phalanges (10), and sesamoid (4).

Review Terms • • • • Process: A prominent projection on a bone Fossa: A relatively deep pit or depression Border: An outline of a bone Notch: A groove/concaved curvature Angle: Convex curvature Tubercle: a small knoblike process Condyle: a rounded process that usually articulates with another bone Epicondyle: a projection situated above a condyle

Scapula Superior angle

Scapula Superior angle Superior border

Scapula Superior angle Coracoid process Superior border

Scapular notch Superior angle Coracoid process Superior border

Scapular notch Superior angle Acromion process Coracoid process Superior border

Scapular notch Superior angle Acromion process Coracoid process Superior border Subscapular fossa

Scapular notch Superior angle Acromion process Coracoid process Superior border Lateral border Subscapular fossa

Scapular notch Superior angle Acromion process Coracoid process Superior border Lateral border Inferior angle Subscapular fossa

Scapular notch Superior angle Acromion process Coracoid process Superior border Lateral border Inferior angle Subscapular fossa Medial border

Scapular notch Superior angle Acromion process Coracoid process Supraspinous fossa Superior border Lateral border Inferior angle Subscapular fossa Medial border

Scapular notch Acromioclavicular joint Superior angle Acromion process Coracoid process Supraspinous fossa Superior border Lateral border Inferior angle Subscapular fossa Medial border

Scapular notch Acromioclavicular joint Superior angle Acromion process Coracoid process Supraspinous fossa Superior border Spine Lateral border Inferior angle Subscapular fossa Medial border

Scapular notch Acromioclavicular joint Superior angle Acromion process Coracoid process Supraspinous fossa Superior border Spine Infraspinous fossa Lateral border Inferior angle Subscapular fossa Medial border

Scapular notch Acromioclavicular joint Superior angle Acromion process Coracoid process Supraspinous fossa Superior border Spine Infraspinous fossa Lateral border Inferior angle Subscapular fossa Medial border Glenoid fossa

Posterior view Anterior view

Head of humerus Posterior view Anterior view

Head of humerus Posterior view Anterior view Greater tubercle

Head of humerus Posterior view Anterior view Greater tubercle Intertubercular groove

Head of humerus Greater tubercle Intertubercular groove Lesser tubercle Posterior view Anterior view

Head of humerus Greater tubercle Intertubercular groove Lesser tubercle Shaft of the humerus Posterior view Anterior view

Head of humerus Greater tubercle Intertubercular groove Lesser tubercle Shaft of the humerus Coronoid fossa Posterior view Anterior view

Head of humerus Greater tubercle Intertubercular groove Lesser tubercle Shaft of the humerus Olecranon fossa Coronoid fossa Posterior view Anterior view

Head of humerus Greater tubercle Intertubercular groove Lesser tubercle Shaft of the humerus Olecranon fossa Coronoid fossa Lateral epicondyle Posterior view Anterior view

Head of humerus Greater tubercle Intertubercular groove Lesser tubercle Shaft of the humerus Olecranon fossa Lateral epicondyle Coronoid fossa Medial epicondyle Posterior view Anterior view Lateral epicondyle

Head of humerus Greater tubercle Intertubercular groove Lesser tubercle Shaft of the humerus Olecranon fossa Lateral epicondyle Coronoid fossa Medial epicondyle Trochlea Posterior view Anterior view Lateral epicondyle Capitulum

Shaft of radius Shaft of ulna Short

Scaphoid

Lunate Scaphoid

Triquetrum Lunate Scaphoid

Triquetrum Pisiform Lunate Scaphoid

Triquetrum Lunate Scaphoid Pisiform Trapezium

Triquetrum Pisiform Lunate Scaphoid Trapezium

Triquetrum Pisiform Lunate Scaphoid Capitate Trapezoid Trapezium

Triquetrum Pisiform Hamate Lunate Scaphoid Capitate Trapezoid Trapezium

II IV V I

Head of metacarpal Shaft of metacarpal Base of metacarpal

Distal phalanx Middle phalanx Proximal phalanx

Head of phalanx Shaft of phalanx Base of phalanx

Base of the metacarpal Shaft of the metacarpal Head of the metacarpal Base of the phalanx Shaft of the phalanx Head of the phalanx Phalanges Proximal phalanx Middle phalanx Distal phalanx

• • S-silly-Scaphoid L-Lovers-Lunate T-Try-Triquetrum P-Positions-Pisiform T-That -Trapezium T-They-Trapezoid C-can’t-Capitate H-handle-Hamate