Study Guide: Bones of the Human Skeleton (ANP College Practical Exam 1)

Bones of the Human Skeleton

Skull Anatomy

The skull is a complex structure composed of several bones that protect the brain and support facial structures. Understanding the anatomy of the skull is essential for students of anatomy and physiology, as it forms the basis for further study of the skeletal system.

• Frontal Bone: Forms the forehead and the upper part of the eye sockets.

• Parietal Bones: Located on the sides and roof of the skull.

• Temporal Bones: Situated at the sides and base of the skull; houses structures of the ear.

• Occipital Bone: Forms the back and base of the skull.

• Sphenoid Bone: Contributes to the floor of the cranium and the sides of the skull.

• Ethmoid Bone: Located between the eyes; forms part of the nasal cavity.

• Lacrimal and Nasal Bones: Small bones forming part of the medial wall of the orbit and the bridge of the nose.

• Maxilla: Upper jaw bone; forms part of the orbit, nose, and palate.

• Zygomatic Bone: Cheekbone; forms part of the orbit.

• Mandible: Lower jaw bone; only movable bone of the skull.

• Coronoid Process, Condylar Process, and other landmarks: Important for muscle attachment and articulation.

Example: The temporomandibular joint (TMJ) is formed by the articulation of the mandible with the temporal bone, allowing movement of the jaw.

Pelvic Anatomy

The pelvis is a ring-like bony structure located at the base of the spine. It supports the weight of the upper body, protects pelvic organs, and provides attachment points for muscles of the lower limb.

• Ilium: The broad, flaring portion of the pelvis.

• Ischium: The lower, posterior part of the pelvis; features the ischial tuberosity, which bears weight when sitting.

• Pubis: The anterior portion of the pelvis; forms the pubic symphysis.

• Sacrum: Triangular bone formed by the fusion of five sacral vertebrae; connects the spine to the pelvis.

• Coccyx: Small, triangular bone at the base of the sacrum; commonly called the tailbone.

• Sacroiliac Joint: Articulation between the sacrum and ilium; transmits weight from the upper body to the lower limbs.

• Greater Sciatic Notch: Allows passage of the sciatic nerve.

• Iliac Crest: Superior border of the ilium; important for muscle attachment.

• Ischial Spine and Ischial Tuberosity: Landmarks for muscle attachment and support.

Example: The pelvic inlet and outlet are important anatomical landmarks for childbirth, as they define the space through which the fetus passes.

Vertebral Column and Thoracic Cage

The vertebral column and thoracic cage provide structural support, protect vital organs, and facilitate movement. The vertebral column consists of individual vertebrae, while the thoracic cage includes the ribs and sternum.

• Common Vertebral Features: Each vertebra has a body, vertebral arch, and processes for muscle attachment.

• Atlas (C1) and Axis (C2): Specialized cervical vertebrae that allow for nodding and rotation of the head.

• Thoracic Cage: Composed of ribs, sternum, and thoracic vertebrae; protects the heart and lungs.

• Rib Anatomy: Ribs articulate with thoracic vertebrae and the sternum; classified as true, false, or floating ribs.

Example: The atlas and axis form a pivot joint, enabling rotation of the head from side to side.

Upper and Lower Limb Bones

The bones of the upper and lower limbs are specialized for movement, support, and manipulation of the environment. Each limb contains a series of bones that articulate at joints to allow a wide range of motion.

• Clavicle and Scapula: Form the pectoral girdle, connecting the upper limb to the trunk.

• Humerus, Radius, and Ulna: Bones of the arm and forearm; articulate at the elbow joint.

• Carpals, Metacarpals, and Phalanges: Bones of the wrist, hand, and fingers.

• Femur, Patella, Tibia, and Fibula: Bones of the thigh, knee, and lower leg.

• Tarsals, Metatarsals, and Phalanges: Bones of the ankle, foot, and toes.

Example: The femur is the longest and strongest bone in the body, supporting the weight of the torso during standing and walking.

Summary Table: Major Bones and Their Functions

Bone	Location	Main Function
Frontal	Skull (forehead)	Protection of brain, structure of face
Ilium	Pelvis	Support, muscle attachment
Atlas	Cervical vertebra (C1)	Head nodding
Femur	Thigh	Weight bearing, movement
Humerus	Upper arm	Movement, muscle attachment
Ribs	Thoracic cage	Protection of organs

Additional info: The study notes above expand upon the brief points in the original materials, providing academic context, definitions, and examples to ensure completeness and usefulness for exam preparation.