:
a median ridge on the internal surface of the vertical part of the human frontal bone
Where is frontal crest located?
The frontal bone is
marked in the midline by
a body ridge, known as the frontal crest. It projects upwards, and acts as a site of attachment for the falx cerebri (a sheet of dura mater that divides the two cerebral hemispheres). In the midline of the ethmoid bone, the crista galli (latin for cock’s comb) is situated.
What is the groove for superior sagittal sinus?
The superior sagittal sinus arises near the crista galli, passes in
the sagittal sulcus
, which is a groove on the internal surface of the frontal, parietal, and squamous parts of the occipital bone. Further, the superior sagittal sinus enters the confluence of sinuses at the internal occipital protuberance.
What bone is the Crista Galli associated with?
The crista galli is a thick, midline, smooth triangular process arising from the superior surface of
the ethmoid bone
, projecting into the anterior cranial fossa.
What surrounds the Crista Galli?
The crista galli (Latin: “crest of the rooster”) is the upper part of the perpendicular plate of
the ethmoid bone
, which rises above the cribriform plate. The falx cerebri (fold of the dura mater) attaches to the crista galli.
What is inside superior sagittal sinus?
The superior sagittal sinus receives
the superior cerebral veins
, veins from the diploë and dura mater, and, near the posterior extremity of the sagittal suture, veins from the pericranium, which pass through the parietal foramina.
What is the purpose of superior sagittal sinus?
The purpose of the superior sagittal sinus is
to carry waste and fluids away from the brain
as veins do throughout the rest of the body.
What are brain sinuses?
The dural venous sinuses (also called dural sinuses, cerebral sinuses, or cranial sinuses) are
venous channels found between the endosteal and meningeal layers of dura mater
in the brain.
What is the weakest part of the skull?
Clinical significance
The pterion
is known as the weakest part of the skull. The anterior division of the middle meningeal artery runs underneath the pterion. Consequently, a traumatic blow to the pterion may rupture the middle meningeal artery causing an epidural haematoma.
Which skull bone is the lower jaw?
The mandible
forms the lower jaw and is the only moveable bone of the skull. At the time of birth, the mandible consists of paired right and left bones, but these fuse together during the first year to form the single U-shaped mandible of the adult skull.
What is your skull made of?
Skull, skeletal framework of the head of vertebrates, composed of
bones or cartilage
, which form a unit that protects the brain and some sense organs.
Is there bone between your nose and brain?
The ethmoid bone
, located at the roof of the nose between the eye sockets, separates the nasal cavity from the brain.
Why is it called the Crista Galli?
Projecting upward from the middle line of the cribriform plate is a thick, smooth, triangular process, the crista galli, so called
from its resemblance to a cock’s comb
. The long thin posterior border of the crista galli serves for the attachment of the falx cerebri.
Which bone is not considered to be part of the cranium?
Which bone is NOT considered to be part of the cranium?
lacrimal bone
[The lacrimal bone is a tiny bone found in the medial portion of the orbit. It is a facial bone, not part of the cranium.]
Where does the straight sinus drain?
The straight sinus is an unpaired area beneath the brain which allows blood to drain from
the inferior center of the head outwards posteriorly
. It receives blood from the inferior sagittal sinus, great cerebral vein, posterior cerebral veins, superior cerebellar veins and veins from the falx cerebri.
Do sinuses have valves?
The cerebral veins and venous
sinuses have no valves
; therefore, blood within them can flow in either direction. The superior sagittal sinus drains into the transverse sinus.
