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The Appendicular Skeleton – The Appendicular Skeleton – Shoulder Girdle and Upper LimbsShoulder Girdle and Upper Limbs
Table of Contents
The Pectoral (Shoulder) Girdle
Composed of two bones Clavicle – collarbone
Acts as a brace to hold the arm away from the top of the thorax
Scapula – shoulder blade
acromion processacromion process
corocoid processcorocoid process
suprascapular notchsuprascapular notch
glenoid cavityglenoid cavity
three bordersthree borders
three anglesthree angles
Scapula
Enlarged end of the spine of thescapula
Beaklike; anchors somemuscles of the arm
Serves as a nerve passageway
Shallow socket that receives thehead of the arm bone
superior, medial (vertebral), and lateral (axillary)
superior, inferior, and lateral
Bones of the Upper LimbBones of the Upper Limb
The upper arm is The upper arm is formed by a formed by a single bonesingle bone HumerusHumerus
Figure 5.21a–b
HumerusHumerusgreater and lesser greater and lesser
tuberclestubercles
deltoid tuberositydeltoid tuberosity
radial grooveradial groove
Processes: trochlea and Processes: trochlea and capitulumcapitulum
Depressions: coronoid Depressions: coronoid fossa and olecranon fossa and olecranon
fossafossa
Sites of muscle attachment
where the deltoid muscle of the shoulder attach
marks the course of the radial nerve
articulate with the bones of the forearm
allows the corresponding processes of the ulna to move freely when the elbow is bent and extended
Forearm
Radioulnar joints
Interosseous membrane
Radial tuberosity
Processes: coronoid and olecranon
where radius and ulnaarticulates
connects radius and ulna along their entire length
where tendon of the bicep muscles attach
grip the trochlea of the humerus in a pliers-like joints
Bones of the Upper LimbBones of the Upper Limb
The handThe handCarpals – wristCarpals – wristMetacarpals – Metacarpals –
palmpalmPhalanges – Phalanges –
fingersfingers
Figure 5.22