WebA horn is a permanent pointed projection on the head of various animals that consists of a covering of keratin and other proteins surrounding a core of live bone.Horns are distinct from antlers, which are not permanent.In mammals, true horns are found mainly among the ruminant artiodactyls, [not verified in body] in the families Antilocapridae and Bovidae …

WebSurface anatomy (also called superficial anatomy and visual anatomy) is the study of the external features of the body of an animal. In birds this is termed topography.Surface anatomy deals with anatomical features that can be studied by sight, without dissection.As such, it is a branch of gross anatomy, along with endoscopic and radiological anatomy. ...

WebDiagnostic characters. Ammonites (subclass Ammonoidea) can be distinguished by their septa, the dividing walls that separate the chambers in the phragmocone, by the nature of their sutures where the septa join the outer shell wall, and in general by their siphuncles.. Septa. Ammonoid septa characteristically have bulges and indentations and are to …

WebAn ebook (short for electronic book), also known as an e-book or eBook, is a book publication made available in digital form, consisting of text, images, or both, readable on the flat-panel display of computers or other electronic devices. Although sometimes defined as "an electronic version of a printed book", some e-books exist without a printed equivalent.

WebThe anglerfish are fish of the teleost order Lophiiformes (/ ˌ l ɒ f i ɪ ˈ f ɔːr m iː z /). They are bony fish named for their characteristic mode of predation, in which a modified luminescent fin ray (the esca or illicium) acts as a lure for other fish. The luminescence comes from symbiotic bacteria, which are thought to be acquired from seawater, that dwell in and …

WebHorn most often refers to: . Horn (acoustic), a conical or bell shaped aperture used to guide sound Horn (instrument), collective name for tube-shaped wind musical instruments Horn (anatomy), a pointed, bony projection on the head of various animals, either the "true" horn, or other horn-like growths Horn, a colloquial reference to keratin, the substance that is …

WebThe spinothalamic tract is a part of the anterolateral system or the ventrolateral system, a sensory pathway to the thalamus.From the ventral posterolateral nucleus in the thalamus, sensory information is relayed upward to the somatosensory cortex of the postcentral gyrus.. The spinothalamic tract consists of two adjacent pathways: anterior and lateral. The …

WebThe hyoid bone (lingual bone or tongue-bone) (/ ˈ h aɪ ɔɪ d /) is a horseshoe-shaped bone situated in the anterior midline of the neck between the chin and the thyroid cartilage.At rest, it lies between the base of the mandible and the third cervical vertebra.. Unlike other bones, the hyoid is only distantly articulated to other bones by muscles or ligaments. . It is the …

WebThe nail consists of the nail plate, the nail matrix and the nail bed below it, and the grooves surrounding it. Parts of the nail. The matrix, sometimes called the matrix unguis, keratogenous membrane, nail matrix, or onychostroma, is the active tissue (or germinal matrix) that generates cells, which harden as they move outward from the nail root to the …

WebA motor neuron (or motoneuron or efferent neuron) is a neuron whose cell body is located in the motor cortex, brainstem or the spinal cord, and whose axon (fiber) projects to the spinal cord or outside of the spinal cord to directly or indirectly control effector organs, mainly muscles and glands. There are two types of motor neuron – upper motor neurons and …