skull

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Related to Skull bones: Cranial bones

skull

 [skul]
the skeleton of the head, consisting of the cranium and the mandible. The cranium forms the domed top, back, and sides of the skull; several of its bones are large, smooth, gently curved, and connected to each other by dovetailed joints called sutures, which permit no movement and make the mature skull rigid. They protect the brain, with their curved exterior serving to deflect blows; the eyes, ears, and nose are also protected by being recessed into the skull and surrounded by bone.



At birth the skull joints are flexible, so that the infant's head can be compressed as it emerges from the birth canal. The joints remain flexible to allow expansion until the cranial bones are fully formed, around the second year of life. An infant's skull contains soft areas, or fontanels, where the bones of the cranium do not meet.

The skull is supported by the highest vertebra, called the atlas. This joint permits a back-and-forth, nodding motion. The atlas turns on the vertebra below it, the axis, which allows the skull to turn from side to side.
Disorders of the Skull. The skull is rarely affected by disease. Uncommon ones like osteitis deformans and acromegaly cause the bones to increase in size. Like other bones, the skull may be fractured by blows, falls, or other accidents, but skull fracture can be far more dangerous because of its proximity to the brain.
Skull, midsagittal section. From Applegate, 2000.

cra·ni·um

, pl.

cra·ni·a

(krā'nē-ŭm, -ă), [TA]
The bones of the head collectively. The neurocranium is the part of cranium that forms the bony brain case containing the brain, excluding the bones of the face (viscerocranium).
Synonym(s): skull
[Mediev. L. fr. G. kranion]

skull

(skul) the cranium; the bony framework of the head, composed of the cranial and facial bones.

skull

(skŭl)
n.
The bony or cartilaginous framework of the head, made up of the bones of the braincase and face; cranium.

skull

Etymology: ME, skulle, shell
the bony structure of the head, consisting of the cranium and the skeleton of the face. The cranium, which contains and protects the brain, consists of 8 bones; the skeleton of the face is composed of 14 bones.

skull

(skŭl)
The bones of the head collectively. In a more limited sense, the neurocranium, the bony braincase containing the brain, excluding the bones of the face (viscerocranium).
[Mid. Eng. skulle, a bowl]

skull

(skul)
Enlarge picture
BONES OF SKULL: Cranial bones
Enlarge picture
BONES OF SKULL: Facial bones
The bony framework of the head, composed of 8 cranial bones, the 14 bones of the face, and the teeth. It protects the brain and sense organs from injury. Synonym: calvaria; cranium See: illustration; skeleton

fractured skull

See: fracture of skullillustration

skull

The bony skeleton of the head and the protective covering for the brain. The part of the skull that encloses the brain is called the cranium.

skull

the skeleton of the vertebrate head.

cra·ni·um

, pl. crania (krā'nē-ŭm, -ă) [TA]
The bones of the head collectively.
Synonym(s): skull.
[Mediev. L. fr. G. kranion ]

skull

the bony framework of the head consisting of two parts, the cranium and the facial section.
The cranium is the domed top, back and sides of the skull that protects the brain. It is made up mostly of a roof of flat membrane bones united by sutures in the young, plus a series of cartilage bones at the base (occipital, sphenoid). Paranasal sinuses variably excavate the membrane bones.
The facial bones are mostly membrane bones and serve to support the dental arcades and the respiratory passages of the head.

skull bones
the bones of the skull are the basisphenoid, ethmoid, frontal, hyoid, incisive, interparietal, lacrimal, nasal, occipital, nasal conchal, palatine, parietal, presphenoid, pterygoid, sphenoid, temporal, vomer and zygomatic.
brachycephalic skull
short, broad skull.
dolicocephalic skull
long, narrow skull.
mesaticephalic skull
a medium skull in terms of width and length.
skull symmetry
asymmetry common only in foals in which the lower part of the face is deviated to one side, involving mandibles, maxillae and nasal bones.
References in periodicals archive ?
When inspecting a shed that had a portion of a skull bone attached, I don't plan on hunting that buck the following year.
Variables were age of the deceased, time of accident, pattern of vascular injury (extradural, subdural, intracerebral or combination of these), skull bones fractured, single or multiple with description of anatomical sites, other associated injuries, status of the deceased (whether passenger or driver), duration of hospital stay, calendar month of accident.
The tomography also showed a double contour of some of the skull bones, suggesting a pathologic proliferative condition.
This study revealed that measurements of five skull bones can be used as accurate predictors of original fork length and total length of bluefish.
The professor also explained how the cremated remains of the dead are carefully placed into urns to reflect the living body, thus the foot bones are placed in first and skull bones last.
Also, blood vessels that feed nasal tissue leave distinct marks on the skull bones of modern crocodiles--Witmer found similar markings on dino skulls.
However, the skull was superficially destructed so that several skull bones were visible through the disrupted bindings.
In this paper, I present some observations on asymmetry in skull bones and laterality in feeding behavior and obstacle avoidance of moose.
The fusion of skull bones is not an axiom; it is an anatomically documented fact, in cadavers and in surgical experience with live patients.
They had thinner skull bones, and based on the brain configuration, if they could not talk, they could at least make a greater variety of sounds.
A rare congenital form of cholesteatoma (one present at birth) can occur in the middle ear and elsewhere, such as in the nearby skull bones.