Which bone is part of both the neurocranium and viscerocranium?
The zygomatic bone is the bridge between the neurocranium and the viscerocranium.
What is the neurocranium?
The 22 irregular bones that make up the human skull are divided into two groups: those that form the neurocranium, and those that form the facial skeleton. The neurocranium (braincase) is comprised of 8 bones, while the facial skeleton is made up of 14 bones.
Why is it called the viscerocranium?
Viscerocranium may refer to one of two related concepts: In human anatomy and development, viscerocranium usually refers to elements of the skull that are not part of the braincase (as opposed to the neurocranium), and which can be subdivided into: The membranous viscerocranium, comprising the facial skeleton.
What is the difference between the calvaria and the cranial base?
The domed dorsal portion of the neurocranium is called the calvaria (skull cap) and is formed by the flat portions of the bones of the neurocranium. The ventral portion of the neurocranium is called the cranial base and is much more irregularly shaped.
Is ethmoid a viscerocranium?
The hyoid bone, ethmoid bone, and sphenoid bones are sometimes included in the viscerocranium.
What are the paired bones of the viscerocranium?
Viscerocranium includes many paired bones i.e. nasal bones, maxillas, zygomatic bones, lacrimals, inferior nasa conchas and palatine bones, as well few unpaired — vomer and mandible.
What is neurocranium and Dermatocranium?
The neurocranium/chondrocranium includes the box that encloses the brain and the capsules surrounding the sense organs. It protects the brain. 2. The splanchnocranium is the visceral portion of the skull that supports the gills and contributes to the jaws. 3.The dermatocranium is the dermal bone that is believed to.
What is the main function of the neurocranium?
The primary functions of the neurocranium are to form the shape of the head and to protect the brain and the organs that control the five senses; the eyes, the ears and the areas of the brain that control touch, taste and smell.
What is neurocranium and viscerocranium?
The neurocranium is a protective shell surrounding the brain and brain stem. The viscerocranium (or facial skeleton) is formed by the bones supporting the face. Except for the mandible, all skull bones are joined together by sutures —synarthrodial (immovable) joints.
What are sutures of calvaria?
Calvaria
| Bones | Frontal, occipital, parietal |
|---|---|
| Sutures | Sagittal – between two parietals Metopic – between two halves of the frontal bone (fuses during first year of life) Coronal – between frontal and two parietals Lambdoid – between parietal and occipital Squamous – between parietal and temporal |
What is a calvaria?
The calvarium is the convexity of the skull and encases the brain parenchyma. It is composed of the frontal, parietal, and occipital bones, and the squamosal portion of the temporal bones.
What type of bone is the viscerocranium?
The viscerocranium or facial bones supports the soft tissue of the face. The viscerocranium consists of 14 individual bones that fuse together. However, the hyoid bone, ethmoid bone, and sphenoid bones are sometimes included in the viscerocranium.