The axial skeleton system contains how many bones?
What are the 3 major regions of the Axial Skeleton?ABC order
Name two sets of skull bones?
What site provides attachment for the head and neck?Cranial or Facial Bones?
Site of attachment for teeth and muscles?Cranial or facial?
* Anterior portion of cranium * Most of anterior cranial fossa* Superior wall of orbits* Contains air-filled frontal sinusName bone?
What suture lies between parietal bones and frontal bone?
What suture lies between right and left parietal bones?
What suture lies between parietal and temporal bones on each side of skull?
* Most of skulls posterior wall and posterior cranial fossa.* Articulates withe 1st vertebra* Sites of attachment for the ligamentum nuchae and many neck and back muscles Name Bone?
* Inferolateral aspects of skull and parts of cranial floor* Four major regions: *Squamous * Tympanic * Mastiod * PetrousName Bone?
Complex, bat-shaped bone
◦ Articulates with all other cranial bones
Three pairs of processes
◦ Greater wings
◦ Lesser wings
◦ Pterygoid processesName bone?
Deepest skull bone
Superior part of nasal septum, roof of nasal cavities
Contributes to medial wall of orbits
Tiny irregularly shaped bones that appear within sutures
Maxillary bones (maxillae) (2)
Zygomatic bones (2)
Nasal bones (2)
Lacrimal bones (2)
Palatine bones (2)
Inferior nasal conchae (2)
What bone is this found?
Largest, strongest bone of face
Temporomandibular joint: only freely movable joint in skullWhat bone is this found?
Medially fused to form upper jaw and central portion of facial skeleton
◦ Articulate with all other facial bones except mandibleName Bone?
Inferolateral margins of orbits Name Bone?
Form bridge of nose?
◦ In medial walls of orbits
◦ Lacrimal fossa houses lacrimal sac Name Bone?
◦ Posterior one-third of hard palate
◦ Posterolateral walls of the nasal cavity
◦ Small part of the orbits
◦ Plow shaped
◦ Lower part of nasal septumName Bone?
Form part of lateral walls of nasal cavity?
Not a bone of the skull
Does not articulate directly with another bone
Site of attachment for muscles of swallowing and speech
Transmits weight of trunk to lower limbs
Surrounds and protects spinal cord
Flexible curved structure containing 26 irregular bones (vertebrae)Name Bone?
Bone inferior to the lumbar vertebrae?
Terminus of vertebral column?
What is the Anterior weight-bearing region?
Composed of pedicles and laminae that, along with centrum, enclose vertebral foramen?
Together make up vertebral canal for spinal cord
Lateral openings between adjacent vertebrae for spinal nerves ?
◦ No body or spinous process
◦ Consists of anterior and posterior arches, and two lateral masses
◦ Superior surfaces of lateral masses articulate with the occipital condyles Which Vertebrae?
◦ Dens projects superiorly into the anterior arch of the atlas◦ Dens is a pivot for the rotation of the atlas Name Vertebrae?
◦ All articulate with ribs at facets and demifacets
◦ Long spinous process
◦ Location of articular facets allows rotation of this area of spineName Vertebra?
◦ Short, thick pedicles and laminae
◦ Flat hatchet-shaped spinous processes
◦ Orientation of articular facets locks lumbar vertebrae together so as to prevent rotation
◦ 5 fused vertebrae (S1–S5)
◦ Forms posterior wall of pelvis
◦ Articulates with L5 superiorly, and with auricular surfaces of the hip bones laterally Name Bone?
◦ 3–5 fused vertebrae
◦ Articulates superiorly with sacrumName Bone?
◦ Composed of
◦ Thoracic vertebrae
◦ Ribs and their costal cartilages
◦ Protects vital organs of thoracic cavity
◦ Supports shoulder girdle and upper limbs
◦ Provides attachment sites for many muscles, including intercostal muscles used during breathing
Three fused bones
Articulates with clavicles and ribs 1 and 2
Articulates with costal cartilages of ribs 2 through 7
◦ Xiphoid process
Site of muscle attachment
Not ossified until ~ age 40Name Bone?
Bones of the limbs and their girdles
◦ Pectoral girdle attaches the upper limbs to the body trunk
◦ Pelvic girdle secures the lower limbs
Clavicles and the scapulae
◦ Attach the upper limbs to the axial skeleton
◦ Provide attachment sites for muscles that move the upper limbs
Flattened acromial (lateral) end articulates with the scapula
Cone-shaped sternal (medial) end articulates with the sternum
Act as braces to hold the scapulae and arms out laterally
Situated on the dorsal surface of rib cage, between ribs 2 and 7
Flat and triangular, with three borders and three angles
Seven large fossae, named according to location
Largest, longest bone of upper limb
Articulates superiorly with glenoid cavity of scapula
Articulates inferiorly with radius and ulna
Medial bone in forearm
Forms the major portion of the elbow joint with the humerus
Lateral bone in forearm
Head articulates with capitulum of humerus and with radial notch of ulna
Interosseous membrane connects the radius and ulna along their entire length
Two hip bones (each also called coxal bone or os coxae)
◦ Attach the lower limbs to the axial skeleton with strong ligaments
◦ Transmit weight of upper body to lower limbs
◦ Support pelvic organs
Each hip bone consists of three fused bones: ilium, ischium, and pubis
Together with the sacrum and the coccyx, these bones form the bony pelvis
◦ Adapted for childbearing
◦ True pelvis (inferior to pelvic brim) defines birth canal
◦ Cavity of the true pelvis is broad, shallow, and has greater capacity
◦ Tilted less forward
◦ Adapted for support of male’s heavier build and stronger muscles
◦ Cavity of true pelvis is narrow and deep
Carries the weight of the body
Subjected to exceptional forces
Three segments of the lower limb
◦ Thigh: femur
◦ Leg: tibia and fibula
◦ Foot: 7 tarsal bones in the ankle, 5 metatarsal bones in the metatarsus, and 14 phalanges in the toes
◦ Medial leg bone
◦ Receives the weight of the body from the femur and transmits it to the foot
◦ Not weight bearing; no articulation with femur
◦ Site of muscle attachment
◦ Connected to tibia by interosseous membrane
◦ Articulates with tibia via proximal and distal tibiofibular joints