What is the frontal crest?
Medical Definition of frontal crest : a median ridge on the internal surface of the vertical part of the human frontal bone.
Where is the sagittal sulcus?
The internal surface of the squama frontalis of the frontal bone is concave and presents in the upper part of the middle line a vertical groove, the sagittal sulcus, the edges of which unite below to form a ridge, the frontal crest; the sulcus lodges the superior sagittal sinus, while its margins and the crest afford …
What structures bound the foramen cecum?
- superior pharyngeal constrictor muscle. Passavant cushion.
- middle pharyngeal constrictor muscle.
- inferior pharyngeal constrictor muscle. Killian dehiscence.
- stylopharyngeus muscle.
- salpingopharyngeus muscle.
What passes through the foramen cecum of frontal bone?
The frontal crest ends below in a small notch which is converted into a foramen, the foramen caecum, by articulation with the ethmoid. This foramen varies in size in different subjects, and is frequently impervious; when open, it transmits a vein from the nose to the superior sagittal sinus.
What passes through the foramen Lacerum?
Function. The artery of pterygoid canal, the nerve of pterygoid canal and some venous drainage pass through the foramen lacerum. Furthermore, one of the terminal branches of the ascending pharyngeal artery (itself a branch of the external carotid artery) passes through the foramen lacerum.
What nerve passes through the Stylomastoid foramen?
The facial nerve exits the skull from the stylomastoid foramen and passes obliquely inferiorly and laterally until it enters the parotid gland. The common facial divisions of the nerve are the temporal, zygomatic, buccal, marginal mandibular, and cervical divisions.
Why is it called the foramen Lacerum?
The foramen lacerum (Latin for lacerated piercing) is a triangular hole in the skull base located between the sphenoid, petrous apex of and basilar part of occipital bone.
What nerve passes through foramen Rotundum?
The maxillary nerve (V2) passes through the foramen rotundum and into the infraorbital canal, where, at the pterygopalatine fossa, it branches into the pterygopalatine ganglion, with parasympathetic and sensory branches to the paranasal sinuses.
What passes through the Vidian Canal?
Contents. It transmits the nerve of pterygoid canal, (Vidian nerve), the artery of the pterygoid canal (Vidian artery), and the vein of the pterygoid canal (Vidian vein).
Where is the foramen magnum Located in humans?
occipital bone
What does the location of your head have to do with walking on two legs?
Modern humans have bodies adapted for walking and running long distances on two legs. The spine of a chimpanzee connects with the skull at the back, holding the head at an angle. The spine of early humans connected with the skull underneath, stabilizing the head when walking upright.
Is foramen magnum part of the brain?
The foramen magnum functions as a passage of the central nervous system through the skull connecting the brain with the spinal cord. On either side of the foramen magnum is an occipital condyle.
What is the hole at the bottom of the skull called?
On the bottom of your skull, there is a distinctive hole. The technical name for the opening is the foramen magnum – the “great hole” that the spinal cord and other critical soft tissues run through.
How many holes do you have in your skull?
The skull contains an astounding 85 openings in the form of foramina, canals and fissures. They provide passageways for the spinal cord, blood vessels, 12 pairs of cranial nerves and so on.
How far down is your skull?
The capacity of an adult human cranial cavity is 1,200–1,700 cm3. The spaces between meninges and the brain are filled with a clear cerebrospinal fluid, increasing the protection of the brain.
Is there a hole in your skull for your ears?
External acoustic meatus (ear canal)—This is the large opening on the lateral side of the skull that is associated with the ear. Internal acoustic meatus—This opening is located inside the cranial cavity, on the medial side of the petrous ridge.
What is the weakest part of the skull?
pterion
Why are there so many holes in your skull?
Yet for thousands of years, trepanation—the act of scraping, cutting, or drilling an opening into the cranium—was practiced around the world, primarily to treat head trauma, but possibly to quell headaches, seizures and mental illnesses, or even to expel perceived demons. …
Can you hear through your forehead?
But this is only half the story. Sound vibrations don’t only reach your cochlea via your ear, but also via the bones of your skull. This is called bone conduction, and it’s pretty amazing! Read on to find out how bone conduction not only allows deaf people to hear, but is also used by elephants and underwater divers!