Skeletal System

Appendicular SkeletonChapter 7

Right Pectoral (Shoulder) Girdle

Right Clavicle

Fractured Clavicle

• One of the most frequently fractured bones in the body.

• Fall on an outstretched arm.• Automobile accidents with people wearing

shoulder harnesses can result in fracture of the clavicle or damage to the median nerve from compression of the clavicle.

Pelvic Brim

• The pelvis is divided into superior and inferior portions by the pelvic brim.– Trace from the sacral promontory along the

arcuate lines of the ilum and the iliopectineal lines of the pubis.

True and False Pelves

• False (greater) pelvis – the portion of the bony pelvis superior to the pelvic brim.– Abdominal cavity.

• True (lesser) pelvis – the portion of the bony pelvis inferior to the pelvic brim.– Pelvic cavity.

Comparison of Male and Female Pelves

• Female• Light and thin• Shallow• Larger and more oval• Small and faces

anteriorly• Oval• Greater than 90° angle

• Male• Heavy and Thick• Deep• Smaller, heart-shaped• Large and faces laterally• Round• Less than 90° angle

Comparison of Male and Female Pelves

• Iliac crest – less curved• Ilium – less vertical• Greater sciatic notch – wide• Coccyx – more movable and

more curved anteriorly• Sacrum – shorter, wider and

more curved anteriorly

• Iliac crest – more curved• Ilium – more vertical• Greater sciatic notch –

narrow• Coccyx – less movable and

less curved anteriorly• Sacrum – longer, narrower

and less curved anteriorly

Comparison of Male and Female Pelves

• Pelvic outlet – wider• Ischial Tuberosity –

shorter, farther apart, and more laterally projecting

• Pelvic outlet – narrower• Ischial Tuberosity –

longer, closer together, and more medially projecting

Patellofemoral Stress Syndrome

• A.K.A. “Runner’s knee.”• During normal flexion and extension of the

knee, the patella tracks (glides) up and down in the groove between the femoral condyles.

• The patella tracks laterally, which causes increased pressure on the joint.

• Pain occurs around or under the patella.