Comprehensive Study Guide: Human Skeletal System Bone List

The Skeletal System

Overview of the Human Skeleton

The human skeleton is composed of 206 bones, providing structure, protection, and support for the body. It is divided into the axial and appendicular skeletons, each containing specific bones and features essential for movement and organ protection.

• Axial Skeleton: Includes the skull, vertebral column, ribs, and sternum.

• Appendicular Skeleton: Includes the limbs and girdles (shoulder and pelvic).

Skull Bones

Cranial Bones

The cranial bones protect the brain and form the structure of the head. Each bone has distinct landmarks important for anatomical identification.

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

  • Supraorbital Foramen: Opening above each orbit for nerves and vessels.

  • Glabella: Smooth area between the eyebrows.

• Parietal Bone: Paired bones forming the sides and roof of the cranium.

• Sphenoid Bone: Central bone of the skull base.

  • Lesser Wing: Small, upper projection.

  • Greater Wing: Larger, lower projection.

  • Sella Turcica: Saddle-shaped depression housing the pituitary gland.

  • Foramen Rotundum, Ovale, Spinosum: Openings for cranial nerves and vessels.

• Ethmoid Bone: Forms part of the nasal cavity and eye orbit.

  • Crista Galli: Vertical projection for attachment of brain membranes.

  • Cribriform Plate: Perforated area for olfactory nerves.

• Temporal Bone: Sides and base of the skull.

  • Zygomatic Process: Articulates with the zygomatic bone.

  • Styloid Process: Pointed projection for muscle attachment.

  • External Auditory Meatus: Ear canal opening.

  • Mastoid Process: Rounded projection behind the ear.

• Occipital Bone: Back and base of the skull.

  • Occipital Condyles: Articulate with the first cervical vertebra.

  • Foramen Magnum: Large opening for the spinal cord.

Facial Bones

Facial bones form the structure of the face and support sensory organs.

• Nasal Bone: Forms the bridge of the nose.

• Lacrimal Bone: Small bone forming part of the eye socket.

• Palatine Bone: Forms part of the hard palate.

• Zygomatic Bone: Cheekbone.

• Nasal Concha: Curved bones in the nasal cavity.

• Vomer: Forms part of the nasal septum.

• Maxilla: Upper jaw.

  • Nasal Process: Projects toward the nose.

  • Infraorbital Foramen: Opening below the orbit.

  • Alveolar Processes: Ridges for teeth attachment.

  • Zygomatic Process: Articulates with zygomatic bone.

• Mandible: Lower jaw.

  • Mandibular Condyle: Articulates with temporal bone.

  • Mandibular Notch: Depression between condyle and coronoid process.

  • Coronoid Process: Attachment for jaw muscles.

  • Mandibular Foramen: Opening for nerves and vessels.

  • Mental Foramen: Opening on the chin.

  • Alveolar Processes: Ridges for teeth attachment.

Sutures

Sutures are immovable joints connecting skull bones.

• Frontal/Coronal Suture: Between frontal and parietal bones.

• Sagittal Suture: Between parietal bones.

• Lambdoid Suture: Between parietal and occipital bones.

• Squamosal Suture: Between parietal and temporal bones.

Hyoid Bone

The hyoid bone is a U-shaped bone in the neck, not directly attached to other bones.

• Greater Horn: Larger lateral projections.

• Lesser Horn: Smaller projections.

Vertebral Column

Types of Vertebrae

The vertebral column consists of three main types of vertebrae, each with unique features.

• Cervical Vertebrae: 7 vertebrae in the neck.

• Thoracic Vertebrae: 12 vertebrae in the upper back.

• Lumbar Vertebrae: 5 vertebrae in the lower back.

Common Vertebral Features

• Body: Main weight-bearing portion.

• Spinous Process: Posterior projection for muscle attachment.

• Lamina: Part of the vertebral arch.

• Transverse Processes: Lateral projections.

• Transverse Foramen: Openings in cervical vertebrae for arteries.

• Vertebral Foramen: Canal for the spinal cord.

Special Cervical Vertebrae

• Axis (C2): Second cervical vertebra.

  • Dens/Odontoid Process: Peg-like projection for rotation.

  • Superior Articular Facets: Articulate with atlas.

• Atlas (C1): First cervical vertebra.

  • Anterior Tubercle: Front projection.

  • Posterior Tubercle: Back projection.

Sacrum and Coccyx

• Sacrum: Five fused vertebrae.

  • Sacral Promontory: Anterior edge.

  • Base: Top of sacrum.

  • Sacral Foramina: Openings for nerves.

  • Ala: Wing-like projections.

  • Median Sacral Crest: Ridge formed by fused spinous processes.

• Coccyx: Tailbone, formed by fused vertebrae.

Thoracic Cage

Ribs

Ribs protect the thoracic organs and assist in breathing.

• Costal Groove: Groove for nerves and vessels.

• Shaft: Main length of the rib.

• Angle: Bend in the rib.

• Tubercle: Articulates with vertebrae.

Sternum

The sternum is the central bone of the chest.

• Suprasternal Notch: Top indentation.

• Clavicular Notch: Articulates with clavicle.

• Manubrium: Upper portion.

• Sternal Angle: Joint between manubrium and body.

• Body: Main portion.

• Xiphoid Process: Lower tip.

Appendicular Skeleton

Upper Extremity

• Clavicle: Collarbone.

  • Acromial End: Lateral end.

  • Sternal End: Medial end.

• Scapula: Shoulder blade.

  • Acromion: Lateral projection.

  • Coracoid Process: Anterior projection.

  • Body: Main portion.

  • Glenoid Cavity: Socket for humerus.

  • Supraspinous Fossa: Above spine.

  • Spine: Ridge across scapula.

  • Infraspinous Fossa: Below spine.

• Humerus: Upper arm bone.

  • Greater Tubercle: Lateral projection.

  • Lesser Tubercle: Anterior projection.

  • Head: Articulates with scapula.

  • Anatomical Neck: Just below head.

  • Surgical Neck: Common fracture site.

  • Lateral/Medial Epicondyle: Muscle attachment sites.

  • Capitulum: Articulates with radius.

  • Olecranon Fossa: Depression for ulna.

• Radius: Lateral forearm bone.

  • Head: Proximal end.

  • Neck: Narrow area below head.

  • Tuberosity: Attachment for muscles.

  • Radial Styloid Process: Distal projection.

  • Ulnar Notch: Articulates with ulna.

• Ulna: Medial forearm bone.

  • Trochlear Notch: Articulates with humerus.

  • Olecranon: Elbow projection.

  • Coronoid Process: Anterior projection.

  • Head: Distal end.

  • Radial Notch: Articulates with radius.

• Hand Bones:

  • Carpal Bones: Eight wrist bones: Hamate, Capitate, Pisiform, Triquetrum, Lunate, Trapezoid, Trapezium, Scaphoid.

  • Metacarpals: Five bones (I-V).

  • Phalanges: Proximal, middle, distal segments (I-V).

Pelvis

• Ilium: Largest hip bone.

  • Ala: Wing-like portion.

  • Iliac Crest: Superior border.

  • Anterior/Posterior Superior/Inferior Iliac Spine: Projections for muscle attachment.

  • Greater Sciatic Notch: Passage for sciatic nerve.

• Pubis: Anterior portion.

  • Inferior Pubic Ramus: Lower branch.

• Ischium: Posterior portion.

  • Ischial Spine: Pointed projection.

  • Lesser Sciatic Notch: Passage for nerves.

  • Ischial Tuberosity: Supports body weight when sitting.

  • Ischial Ramus: Branch connecting to pubis.

• Obturator Foramen: Large opening for nerves and vessels.

• Acetabulum: Socket for femur.

• Pubic Symphysis: Cartilaginous joint between pubic bones.

Lower Extremity

• Femur: Thigh bone.

  • Head: Articulates with acetabulum.

  • Neck: Connects head to shaft.

  • Lesser/Greater Trochanter: Muscle attachment sites.

  • Intertrochanteric Crest: Ridge between trochanters.

  • Lateral/Medial Epicondyle: Distal projections.

  • Lateral/Medial Condyle: Articulate with tibia.

  • Patellar Groove: Articulates with patella.

  • Linea Aspera: Ridge on posterior shaft.

• Patella: Kneecap.

  • Apex: Pointed end.

  • Base: Broad end.

• Tibia: Medial leg bone.

  • Intercondylar Eminence: Ridge between condyles.

  • Lateral/Medial Condyle: Proximal ends.

  • Tibial Tuberosity: Attachment for patellar ligament.

  • Medial Malleolus: Distal projection.

• Fibula: Lateral leg bone.

  • Head: Proximal end.

  • Lateral Malleolus: Distal projection.

• Tarsal Bones: Seven ankle bones: Calcaneus, Navicular, Cuboid, Talus, Lateral/Intermediate/Medial Cuneiform.

• Metatarsals: Five bones (I-V).

• Phalanges: Proximal, middle, distal segments (I-V).

Summary Table: Major Bone Groups and Key Features

Bone Group	Key Bones	Important Features
Skull	Frontal, Parietal, Sphenoid, Ethmoid, Temporal, Occipital	Foramina, processes, sutures
Facial	Maxilla, Mandible, Zygomatic, Nasal, Lacrimal, Palatine, Vomer	Foramina, processes, alveolar ridges
Vertebral Column	Cervical, Thoracic, Lumbar, Sacrum, Coccyx	Body, spinous/transverse processes, foramina
Thoracic Cage	Ribs, Sternum	Grooves, notches, angles
Upper Extremity	Clavicle, Scapula, Humerus, Radius, Ulna, Carpals, Metacarpals, Phalanges	Processes, fossae, tubercles, notches
Pelvis	Ilium, Ischium, Pubis	Crests, spines, notches, foramina
Lower Extremity	Femur, Patella, Tibia, Fibula, Tarsals, Metatarsals, Phalanges	Condyles, trochanters, malleoli, tuberosities

Example: Clinical Application

Understanding bone landmarks is essential for medical professionals. For example, the foramen magnum is a critical site for the passage of the spinal cord, and fractures of the surgical neck of the humerus are common in elderly patients.

Additional info: This guide expands on the original list by providing definitions, anatomical context, and clinical relevance for each bone and feature. It is suitable for exam preparation and practical identification in anatomy and physiology courses.