Major Bones and Landmarks of the Human Skeleton

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The Skull

Major Bones and Landmarks

The human skull is a complex structure composed of several bones and anatomical features that protect the brain and form the structure of the face. Understanding the names and locations of these bones and landmarks is essential for students of anatomy and physiology.

Frontal Bone: Forms the forehead and the upper part of the eye sockets (orbits).
Parietal Bone: Paired bones forming the sides and roof of the cranial cavity.
Occipital Bone: Forms the back and base of the skull; contains the foramen magnum.
Temporal Bone: Located at the sides and base of the skull; houses structures of the ear.
Sphenoid Bone: Butterfly-shaped bone at the base of the skull; contains the sella turcica.
Zygomatic Bone: Cheekbone; forms part of the orbit.
Ethmoid Bone: Located between the eyes; forms part of the nasal cavity and septum.
Lacrimal Bone: Small bone forming part of the medial wall of the orbit.
Nasal Bone: Forms the bridge of the nose.
Maxilla: Upper jaw bone; forms part of the orbit, nose, and palate.
Palatine Bone: Forms part of the hard palate of the mouth and the floor of the nose.
Vomer: Forms part of the nasal septum.
Mandible: Lower jaw bone; the only movable bone of the skull.
Ramus: Vertical part of the mandible.
Crista Galli: Vertical projection of the ethmoid bone; attachment for brain membranes.

Key Foramina, Sutures, and Processes

Supraorbital Fissure: Opening above the orbit for nerves and vessels.
Infraorbital Fissure: Opening below the orbit.
Mastoid Process: Projection of the temporal bone behind the ear; attachment for neck muscles.
Styloid Process: Slender pointed piece of bone just below the ear.
Foramen Magnum: Large opening in the occipital bone for the spinal cord.
Jugular Foramen: Passage for the jugular vein and cranial nerves.
Optic Foramen: Opening for the optic nerve.
Foramen Ovale: Opening in the sphenoid bone for nerves.
Sagittal Suture: Joint between the two parietal bones.
Coronal Suture: Joint between the frontal and parietal bones.
Lambdoidal Suture: Joint between the parietal and occipital bones.
Cribriform Plate: Part of the ethmoid bone with small holes for olfactory nerves.
Sella Turcica: Depression in the sphenoid bone housing the pituitary gland.
External Auditory Meatus: Canal leading to the eardrum.

Additional Features

Sinuses: Air-filled spaces in the frontal, ethmoid, sphenoid, and maxillary bones.
Fontanels: Soft spots in the fetal skull (anterior, posterior, sphenoid, mastoid).
Alveoli: Sockets for teeth in the maxilla and mandible.
Carotid Canal: Passage for the carotid artery.

Pelvic Girdle

Bones and Landmarks

The pelvic girdle supports the weight of the upper body and protects pelvic organs. It consists of paired hip bones and associated structures.

Ilium	Symphysis Pubis	Acetabulum
Pubis	Obturator Foramen	Ischium
Coxal (Os Coxa)

Ilium: Largest part of the hip bone.
Pubis: Anterior part of the hip bone.
Ischium: Lower, posterior part of the hip bone.
Acetabulum: Socket for the femur head.
Obturator Foramen: Large opening for nerves and blood vessels.
Symphysis Pubis: Cartilaginous joint between pubic bones.

Femur

Bony Landmarks

The femur is the longest and strongest bone in the body, forming the thigh.

Head	Greater Trochanter	Lateral Epicondyle
Medial Condyle	Lesser Trochanter	Medial Epicondyle

Head: Articulates with the acetabulum.
Greater/Lesser Trochanter: Muscle attachment sites.
Medial/Lateral Epicondyle: Sites for ligament attachment.
Medial/Lateral Condyle: Articulate with tibia.

Tibia

Bony Landmarks

The tibia is the main weight-bearing bone of the lower leg.

Lateral Condyle	Medial Malleolus	Anterior Crest
Medial Condyle	Tibial Tuberosity	Tibial Plateau

Medial/Lateral Condyle: Articulate with femur.
Medial Malleolus: Prominent bump on inner ankle.
Tibial Tuberosity: Attachment for patellar ligament.
Anterior Crest: Sharp ridge on the front of the tibia.

Fibula

Bony Landmarks

The fibula is the slender bone of the lower leg, lateral to the tibia.

Head	Lateral Malleolus

Head: Proximal end of the fibula.
Lateral Malleolus: Prominent bump on outer ankle.

Foot

Bones and Landmarks

The foot consists of tarsal, metatarsal, and phalangeal bones, providing support and mobility.

Tarsals	Cuboid	Metatarsals
Calcaneus	Navicular	Phalanges

Tarsals: Seven bones forming the ankle.
Calcaneus: Heel bone.
Navicular, Cuboid: Tarsal bones.
Metatarsals: Five long bones of the foot.
Phalanges: Toe bones.

Humerus

Bony Landmarks

The humerus is the bone of the upper arm, connecting the shoulder to the elbow.

Greater Tubercle	Lateral Epicondyle	Olecranon Fossa
Lesser Tubercle	Medial Epicondyle	Coronoid Fossa
Capitulum	Trochlea

Greater/Lesser Tubercle: Muscle attachment sites.
Medial/Lateral Epicondyle: Ligament attachment sites.
Olecranon/Coronoid Fossa: Depressions for ulna during elbow movement.
Capitulum/Trochlea: Articulate with radius and ulna.

Radius

Bony Landmarks

The radius is one of the two bones of the forearm, located on the thumb side.

Head	Radial Tuberosity	Styloid Process

Head: Proximal end, articulates with humerus.
Radial Tuberosity: Attachment for biceps muscle.
Styloid Process: Distal projection at the wrist.

Ulna

Bony Landmarks

The ulna is the medial bone of the forearm, on the side of the little finger.

Coronoid Process	Styloid Process	Trochlear Notch
Olecranon Process	Radial Notch

Olecranon Process: Forms the elbow.
Coronoid Process: Anterior projection for muscle attachment.
Trochlear Notch: Articulates with humerus.
Styloid Process: Distal projection at the wrist.
Radial Notch: Articulates with radius.

Hand

Bones and Landmarks

The hand consists of carpal (wrist), metacarpal (palm), and phalangeal (finger) bones.

Carpals	Pisiform	Trapezium
Scaphoid (Navicular)	Hamate	Metacarpals
Lunate	Capitate	Phalanges
Trapezoid	Triangular (Triquetrum)

Carpals: Eight wrist bones.
Metacarpals: Five bones forming the palm.
Phalanges: Finger bones (proximal, middle, distal).

Sternum

Bony Landmarks

The sternum is the flat bone at the center of the chest, connecting the ribs.

Manubrium	Body	Xiphoid Process

Manubrium: Upper part of the sternum.
Body: Central part.
Xiphoid Process: Small, cartilaginous lower tip.

Ribs

Types of Ribs

The ribs protect the thoracic organs and assist in breathing.

True Ribs: First seven pairs, directly attached to sternum.
False Ribs: Next three pairs, attached indirectly.
Floating Ribs: Last two pairs, not attached to sternum.

Vertebrae

Types and Major Parts

The vertebral column supports the body and protects the spinal cord. It consists of different types of vertebrae, each with unique features.

Cervical (C1-C7)	Transverse Foramen	Lamina
Axis (C2)	Vertebral Foramen	Pedicle
Thoracic (T1-T12)	Transverse Process	Body (Centrum)
Lumbar (L1-L5)	Odontoid Process (Dens)

Cervical Vertebrae (C1-C7): Smallest, with transverse foramina for arteries.
Atlas (C1): Supports the skull.
Axis (C2): Has the odontoid process (dens) for rotation.
Thoracic Vertebrae (T1-T12): Articulate with ribs.
Lumbar Vertebrae (L1-L5): Largest, support most weight.
Spinous Process: Posterior projection for muscle attachment.
Body (Centrum): Main weight-bearing part.

Other Bones

Clavicle, Hyoid, Sacrum, Coccyx

These bones have specialized functions in the body.

Clavicle: Collarbone; connects sternum to scapula.
Hyoid: U-shaped bone in the neck; supports tongue.
Sacrum: Triangular bone at the base of the spine; forms part of the pelvis.
Coccyx: Tailbone; small, fused vertebrae at the end of the spine.

Additional info:

Many of the listed features are important anatomical landmarks for clinical assessment, surgical procedures, and understanding musculoskeletal function.
Some bones (e.g., fontanels, crista galli) are especially relevant in developmental anatomy and neuroanatomy.