ClipArt ETC
"Right pectoral arch of a bird. s, scapula; c, coracoid; gl, glenoid, the cavity for head of humerus; cl, clavicle; hc, hypecleidium. In situ, the right end of the figure should tilt up a little. The pectoral arch is that bony structure by which the wings are borne upon the axial skeleton. It is to the fore limb what the pelvic arch is to the hind limb; but is disconnected from the back-bone and united with the breastbone, whereas the reverse arrangement obtains in the pelvic, which is fused with the sacral region of the spine. Each pectoral arch of birds consists (chiefly) of three bones: the scapula and coracoid, forming the shoulder-girdle proper, or scapular arch; and the accessory clavicles, or right and left half of the clavicular arch." Elliot Coues, 1884

The Right Pectoral Arch of a Bird

"Right pectoral arch of a bird. s, scapula; c, coracoid; gl, glenoid, the cavity for head of humerus;…

Shoulder joint with some of its ligaments.

Shoulder Joint, with some of its Ligaments

Shoulder joint with some of its ligaments.

The shoulder joint. Labels: a, the clavicle; b, the scapula.

The Shoulder Joint

The shoulder joint. Labels: a, the clavicle; b, the scapula.

The frontal section through the right shoulder joint of a boy. Arm abducted to a right angle.

Frontal Section Through Shoulder Joint

The frontal section through the right shoulder joint of a boy. Arm abducted to a right angle.

A horizontal section through the left shoulder joint of a boy. Arm abducted to a right angle.

Horizontal Section Through Shoulder Joint

A horizontal section through the left shoulder joint of a boy. Arm abducted to a right angle.

The shoulder joint (articulatio humeri) and the ligaments of the scapula.

Shoulder-joint and Ligaments of the Scapula

The shoulder joint (articulatio humeri) and the ligaments of the scapula.