Pelvic and Pectoral Girdles

Skeletal System

Skull

Thoracic cage

(ribs and sternum)

(a) Anterior view

Cranium

Sacrum

Vertebral

column

Clavicle Scapula Sternum Rib Humerus Vertebra

Radius Ulna Carpals

Phalanges Metacarpals Femur

Patella

Tibia

Fibula

Tarsals Metatarsals

Phalanges

The Pelvic Girdle

Components

Ossa coxae (hip bones)

Ilium

Ischium

Pubis

Function

Supports trunk

Leg attachment

Pelvic Girdle

Bony pelvis

Ossa coxae

Sacrum

Coccyx

Pelvic Girdle

Female Male

General structure Less massive Massive, robust, heavy

Sacrum Broad, less curved Narrow, more curved

Symphysis Shallow Wide

Pelvic inlet Larger, circular Narrower, heart shaped

Pelvic outlet Wide, ischial spines spaced Narrow, ischial spines close

Pubic arch Obtuse angle >90° Acute angle <90°

Obturator foramen Triangular Oval

Iliac crest Low High

Pectoral Girdle

A.k.a. Thoracic or shoulder girdle

Components

Clavicle

Scapula

Function

Attach upper limbs to axial skeleton

Attachment points for muscles

Questions?

Study Hard!