What is neurocranium and dermatocranium?

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 differentiates chondrocranium splanchnocranium and dermatocranium from each other?

The chondrocranium, a cartilaginous neurocranium, protects the brain, otic, and nasal organs. The splanchnocranium is present as a continuous visceral skeleton, has a pharyngeal basket, and is branchial in function. The dermatocranium is present as a dermal head skeleton and varies depending on group.

Is the Dentary dermatocranium?

The dermatocranium comprises the skull roof, the facial skeleton (usually excluding the dentary), and—in fishes—the opercular bones.

Do Ostracoderms have splanchnocranium?

The hyoid arch (3rd segment) surrounded the spiracle opening. The Ostracoderms, with one fused head plate of dermal bone (extinct) and modern Agnathans (e.g. Lamprey), lack jaws and display the paleostylic condition, in which none of the gill arches are directly associated with the skull.

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.

What does the dermatocranium do?

The dermatocranium forms most of the skull and functions as a protective shield for the brain.

What is cartilaginous neurocranium?

The neurocranium is divided into two portions: the membranous part, consisting of flat bones, which surround the brain; and. the cartilaginous part, or chondrocranium, which forms bones of the base of the skull.

Why is it called Viscerocranium?

The viscerocranium is a collection of bones that make up the face skeleton. It is named in contrast to the neurocranium (braincase), or the bones of the skull that accommodate the human brain.

Why is it called the neurocranium?

In human anatomy, the neurocranium, also known as the braincase, brainpan, or brain-pan is the upper and back part of the skull, which forms a protective case around the brain. In the human skull, the neurocranium includes the calvaria or skullcap….

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Anatomical terms of bone

Which bones are the neurocranium?

The bones that make up the neurocranium include the sphenoid, temporal, ethmoid, parietal, occipital and frontal bones. Remember these bones quickly with the mnemonic “STEP OF” which is combined out of the first letters of the every word.

What is a neurocranium?

Medical Definition of neurocranium : the portion of the skull that encloses and protects the brain.

What is the difference between 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.