ANT 3331 - Frontal and Parietal bone terms

frontal squama

vertical forehead

temporal lines

lateral sides of bone; attachment of temporalis muscle (chewing)

supraorbital margins

upper edges of orbits; notched or pierced by supraorbital notch or foramen

foramen secum

hole at base of frontal crest

lacrimal fossae

lateral, inferior part of orbital surface; for lacrimal gland

sides and roof of neurocranium

articulates with other parietal, frontal, temporal, occipital and sphenoid; one of largest bones in neurocranium; ossifies in membrane from center near parietal boss

sphenoidal angle

located at pterion

mastoid angle

located at asterion

parietal striae

ectocranial striations near squamosal suture

sigmoid sulcus

groove crosses mastoid angle of endocranial surface; for sigmoid sinus (drains blood from brain)

frontal bone

- front of neurocranium

- articulates with parietals, nasals, maxillae, sphenoid, ethmoid, lacrimals, and zygomatics

- ossifies on membrane from 2 primary centers (fuse along metopic suture)

orbital plates

- horizontal portions of frontal

- orbital side on smooth and concave, the endocranial side is rugose

frontal bosses

2 eminences marking original centers of ossification

zygomatic processes

lateral, anterior corners of frontal

supercilliary arches

brow ridges above orbits; prominent in males; can be joined by prominent glabellar region

supraorbital notch or foramen

on medial half of superior orbital rim; transmit supraorbital nerve and vessels

metopic suture

vertical suture between right and left frontal halves; rare in adults, but may be found at glabella

meningeal grooves

endocranial surface of frontal squama; for middle meningeal arteries (supply dura mater)

sagittal sulcus

vertical groove at sagittal edge (midline) of endocranial surface; for superior sagittal sinus (drains blood from brain)

frontal crest

endocranial midline crest; falx cerebri attaches here

ethmoidal notch

gap separating 2 orbital plates of frontal, ethmoid bone fills this in an articulated cranium

frontal sinus

anterior to ethmoidal notch, a hollow chamber

parietal boss

large eminence marking original center of ossification

frontal angle

located at bregma

occipital angle

located at lambda

superior temporal line

attachment of temporal fascia (covering) (1)

inferior temporal line

attachments of temporalis muscle (chewing) (2)