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72 terms

Axial/ Appendicular skeleton

What is the purpose of the supraorbital foramen?
To transmit the supraorbital vessels & opthalmic branch of the trigeminal nerve.
What the glabella?
The smooth generally hairless area between the superciliary arch.
What attaches on the styloid processes of the temporal bones?
Muscles & ligaments
What attaches at the mastoid processes of the temporal bones?
Muscles of the neck
What runs through the carotid canal, & what is its purpose?
Carotid artery; supplies blood to the brain
What is the purpose of the jugular canal?
To allow the venous sinuses to drain into the internal jugular vein
What nerve runs through the internal auditory meatus?
Vestibulocochlear nerve
What contains the hearing and equilibrium receptors?
The petrous portion
What do the occipital condyles articulate with?
The atlas (C1)
What is the purpose of the superior orbital fissure?
To transmit the oculomotor, trochlear, and abducens nerves
What accommodates the pituitary gland?
Sella turcica
What is the optic foramina?
The opening for the optic nerve
What is the purpose of the foramen ovale?
To transmit the mandibular branch of the trigeminal nerve
What runs through foramen lacerum?
The internal carotid artery
What does foramen rotundum transmit?
The maxillary branch of the trigeminal nerve
What is foramen spinosum?
The opening for the middle meningeal artery
What attaches at the pterygoid processes?
Some of the muscles that move the mandible
What attaches at the crista galli?
The falx cerebri
What passes through the cribiform plate?
filaments of the olfactory nerves
What is the only movable skull bone other than the ossicles?
The mandible
What forms the temporomandibular joint (TMJ) with the mandibular fossa?
Mandibular condyles
What is the insertion point for the temporalis muscle?
Coronoid process of the mandible
What is the purpose of the mental foramen?
The lateral aspect of it allows nerves to pass to the chin and lip
What are the bony tooth sockets called?
What is the infraorbital foramen?
The opening for the maxillary branch of the trigeminal nerve
What is the purpose of the incisive foramen?
To transmit blood vessels (greater palatine) and nerves (nasopalatine)
What is the largest of the paranasal sinuses?
Maxillary sinus
What is the smallest bones of the face?
Lacrimal bones
What forms the inferior portion of the nasal septum?
What bone is located between the mandible and larynx?
the hyoid; It provides an attachment site for muscles that elevate the larynx when swallowing
What are the names of the 3 ossicles, and where are they located?
Malleus, Incus, and Stapes; located in the tympanic cavity (inner ear)
What is the anterior longitudinal ligament?
The ligament that runs down the vertebral column, & is firmly attached to both the vertebrae & discs.
What does the anterior longitudinal ligament prevent?
What is the posterior longitudinal ligament?
Not as strong as anterior ligament, & attaches only to discs. It prevents hyperflexion
What are the interverbral discs?
Cushion-like pads that act as shock absorbers; allow the spine to flex, extend, & flex laterally. Thickest in the lumbar and cervical regions.
What are the names of 2 aspects of the intervertebral discs?
*Nucleus pulposes-inner gelatinous substance that gives the disc its compressibility & elasticity
*Annulus fibrosus- Surrounds the nucleus
What are the special features of the lumbar vertebrae?
*Sturdier structure reflects weight-bearing function
*Pedicles & lamina are shorter & thicker
*Spinous proceses project directly backward
*Orientation of superior articular facet is medially & the inferior articular facet is laterally (serves to provide stability by preventing rotation, but allowing flexion/extension)
What are known as primary curves in regard to spinal curvature?
Thoracic and sacral curvature which are convex posteriorly (bulging out)
What are considered secondary curves?
Cervical and lumbar curvatures which are concave posteriorly (cupping in)
When does the cervical curve form in the spine?
When the infant begins to hold their head erect (at 3 months)
When does the lumbar curve form?
When the child begins to sit up, stand, and walk
What are the 3 abnormal curvatures of the spine?
*Scoliosis- Lateral curvature of the spine
*Lordosis- Accentuated lumbar curvature
*Kyphosis- Exaggerated thoracic curvature
What are the pedicles on the vertebrae?
They project posteriorly from the body and form the lateral walls of the vertebral arch.
What is the function of the vervical vertebrae?
To support the skull; they allow controlled head movement.
What do the superior articular facets articulate with?
The occipital condyles of the occipital bone (which supports the head)
What movement do the superior articular facets allow for?
Anterior (flexion) and posterior (extension) movement of the head (nodding yes)
What is the articular facet for the dens?
It accommodates the dens, & is located on the anterior portion of the vertebral foramen
What is the dens?
The odontoid process on C2; projects superiorly through the facet for dens on C1
What is the axis C2?
Acts as a pivot on which the atlas and head rotate (signifying NO)
Where are the vertebral foramina the largest on the spinal column?
Cervical vertebrae
What is the purpose of the ligamentum nuchae?
To maintain the cervical curve when the head is upright (acts like a bowstring)
What is bifid?
The divet in the spinous processes of C2-C6
What is known as vertebra prominens?
What do the thoracic vertebrae help with?
They articulate with the ribs to allow volumetric changes in the thoracic cage
What are demifacets?
The area on most of the thoracic vertebrae that articulates with the ribs
What forms the posterior wall of the pelvis?
What is the median sacral crest?
The fused spinous processes of the sacral vertebrae
What is the lateral sacral crest?
Remnants of the transverse processes of S1-S5
What does the sacral foramina allow for?
Transmission of nerves and blood vessels
What accommodates the vertebral canal?
Sacral canal
What is the auricular surface of the sacrum?
It articulates with the ilium to form the sacroiliac joints of the pelvis.
What age range do the vertebra of the coccyx fuse together?
What makes up the thorax?
12 pairs of ribs; sternum; thoracic vertebrae
What are the true ribs?
Superior 7 ribs that attach directly to the sternum by separate costal cartilages
What are the false ribs?
Inferior 5 ribs that attach indirectly to the sternum or lack an attachment; ribs 8-10 attach indirectly and form the costal margin; ribs 11-12 do not attach at all (floating ribs)
What is the costal groove of the ribs?
The inferior medial border that accommodates the intercostals nerve.
What is thy xiphoid process of the sternum?
Made of hyaline cartilage; Serves as an attachment point for the rectus abdominus and diaphragm
What is the purpose of the clavicular curves?
To ensure that a fracture would happen anteriorly. A posterior fracture could tear the subclavian artery.
What is the metacarpus?
the palm of hand
What are phalanges and how many do we have in five digits?
Fingers/toes; We have 14 phalanges in 5 digits. Each single bone is a phalanx
What is the fovea capitis?
Small pit for the ligamentum teres which secures the head to the acetabulum.
What is the weakest part of the femur?
The neck