Unit 4: Bones Flashcards
Axial skeleton
Contains skull, vertebral, column, sternum, and ribcage
Appendicular skeleton
Bones within upper & lower limbs including pectoral and pelvic girdles
Diaphysis
Shaft of bone
Epiphysis
Where bone grows
Epiphyseal line
When growth stops and epiphyseal plate turns into line
Medullary cavity
Hallow part of bone containing bone marrow
Endosteum
Membrane on the inner surface, connecting tubules, and coating trabeculae
Periosteum
Membrane that surrounds its outside surface
Yellow bone marrow
Calcium, phosphates, and triglycerides
Red bone marrow
Makes all types of blood cells
Articular cartilage
Weeps lubricant between bones preventing friction and moveable joints
Long bones
Long central shaft
Short bones
Cube shaped
Flat bones
Flattened and usually curved
Irregular bones
All other types of bones
Spongy bone
Lines the medullary cavity along the diaphysis. Provide support and resist forces
Compact bone
Forms thick outer cortex of bone encased by periosteum
Osteon
Column like pillars that make up the outside cortex of diaphysis and epiphyses
Central canal
Contains blood vessels, lymphatic vessels, and nerves
Perforating canals
Punch into (perforate) compact bone of diaphysis
Lamellae
Extracellular matrix of bone
Canaliculi
Tiny canals connecting osteocytes
Osteocytes
Mature bone cells contained in lacunae
Lacuna
Space osteocytes sit in
Frontal bone
Anterior forehead cranial bone
Parietal bones
Cranial bones that make up most of bony wall
Sagittal suture
Articulates two parietal bones within sagittal plane
Coronal suture
Suture connecting frontal bone with parietal bones
Temporal bones
Two lateral cranial bones
Squamous suture
Parietal bone articulates with corresponding temporal bone
External auditory meatus
Passageway leads from outside of head to tympanic membrane (eardrum membrane)
Internal auditory meatus
Canal in temporal bone that extends to cochlea
Styloid process
Long slender projection of temporal bone
Zygomatic process
Process of temporal bone that articulates with zygomatic bone
Mastoid process
Smooth conical projection of bone at the base of mastoid area of temporal bone
Mandibular fossa
Oval depression behind the anterior root of zygomatic process of temporal bone
Jugular foramen
Opening that allows internal jugular vein to travel through it
Carotid canal
Passageway of carotid artery
Foramen lacerum
Irregular opening in the middle of cranial fossa at base of skull
Occipital bone
Posterior cranial bone
Lambdoid suture
Connects occipital bone with two parietal bones
Foramen magnum
Passage of central nervous system from skull connecting brain with spinal cord
Hypoglossal canal
Allows hypoglossal nerve to make way to bottom of tongue
Occipital condyles
Smooth rounded surface of occipital bone that free moving joint with first vertebra
Nuchal lines
Where muscles and ligaments of neck/back attach to occipital bone
External occipital protuberance
Raised area on midline of occipital bone where posterior wall meets the base of skull
Sphenoid bone
Cranial bony floor wall (bat)
Sella turcica
Depression of sphenoid bone
Superior orbital fissures
Slit-like openings that allow nerves to travel to eye for movement
Optic canals
Canal that is part of sphenoid bone extending from optic foramen to orbital apex
Foramen rotundum
Round shape opening that allows passage of nerve branches that contain motor and sensory fibers
Foramen spinosum
Hole located in the greater wing of sphenoid
Foramen ovale
Oval shape opening that allows passage of nerve branches that contain motor and sensory fibers
Ethmoid bone
Small portion of wall of skull (chicken comb)
Crista galli
Helps anchor brain meninges within cranial body cavity
Cribriform plate
Where smelling nerve structures pass through from brain to nasal cavity
Superior nasal conchae
Small/cured plate of bone representing medial/bony process of the labyrinth of ethmoid bone
Middle nasal conchae
Medial bony projections of ethmoid bone
Mandible
Lower jaw
Mandibular condyle
Free moving joint of mandible with temporal bone and its condyle
Coronoid process
Serves as attachment for muscles that move jaw during chewing/talking
Maxillae
Form upper jaws of face
Palatine process
Maxilla bone that articulates with palatine bone
Palatine bones
Form part of the hard palate (roof of oral cavity)
Zygomatic bones
Cheekbones
Temporal process
When temporal bone, zygomatic bone, and zygomatic process form part of zygomatic arch
Lacrimal bones
Adjacent to lacrimal sac that catches tears at medial corner of eyes
Nasal bones
At bridge of nose
Inferior nasal conchae
Form the lateral-inferior walls of nasal cavity
Vomer
Single blade-shaped bone forms the posteroinferior portion of nasal septum
Hyoid
U-shaped solitary bone in the midline of neck anteriorly at base of mandible
Anterior fontanelle
Junction of 2 frontal & 2 parietal bones meet
Posterior fontanelle
Triangular and lies at apex of occipital bone
Zygomatic arch
Bridge of bone extending from temporal bone to maxilla
Zygomatic process
Temporal bone that articulates with zygomatic bone
Temporal process
When temporal bone, zygomatic bone, and zygomatic process form part of zygomatic arch