DEVELOPMENT OF THE FACE EPUB

my presentation with elaborate discription on development of face. This article briefly highlights the key aspects of facial development. Congenital anomalies of the face are discussed in further detail elsewhere. Development of The Palate. The face is built up from "facial swellings" as a result of mesodermal masses lifting the surface ectoderm. At the end of week 4.


DEVELOPMENT OF THE FACE EPUB

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DEVELOPMENT OF THE FACE EPUB

Pharyngeal arches[ edit ] Pharyngeal arches are formed during the fourth week.

Each arch consists of a mesenchymal tissue covered on the development of the face by ectoderm and on the inside by epithelium of endodermal origin. In human embryology, there are six arches which are separated by pharyngeal grooves externally and pharyngeal pouches internally.

These arches contribute development of the face the physical appearance of the embryo because they are the main components that build the face and neck.

In addition, the muscular components of each arch have their own cranial nerve, and wherever the muscle cells migrate, they carry their nerve component with them.

Face and neck development of the human embryo

Plus, each arch has its own arterial component. When neural cells migrate to the arches and surround them, they begin to increase in size. When the embryo is 42 days old, the mesenchymal arches can be recognized with development of the face corresponding cranial nerve.

It is innervated by the trigeminal nerve and molds muscles related to mastication such as temporal, massetermedial, lateral, pterygoid bonestensor palatine, and tensor tympani. This arch originates maxillar and mandibular prominences, part of the temporal bone and Meckel's cartilage malleus and incus as skeletal structures.

The second pharyngeal arch development of the face innervated by the facial cranial nerve.

Muscles that development of the face from development of the face arch are those involved with facial expression and the posterior digastric muscle. Skeletal structures that originate here are the cervical sinusReichert cartilage stape the styloid process of the temporal bonethe lesser cornu and the hyoid bone.

It molds the stylopharyngeus muscle and forms the skeletal structures of the greater horn and lower portion of body hyoid bone. Both arches development of the face fuse to form the laryngeal cartilages. The fifth cartilage does not appear to have any contribution to adult anatomy and disappears.

The pouches penetrate the surrounding mesenchyme but do not establish communication with the pharyngeal grooves. They appear simultaneously with the development of the arches. However, it does not disappear and eventually forms the eustachian tube. Second pharyngeal pouch develops differently from the first one mainly because most of it disappears, leaving the tonsillar fossa Rohen.

DEVELOPMENT OF THE FACE EPUB

At the end of the fifth month, the palatine tonsil as a protective structure is completed. This structure covers the tonsillar fossa. The third pharyngeal pouch will give rise to the inferior parathyroid gland and thymus.

Most of these structures obliterates.

Chapter The Face - Review of Medical Embryology Book - LifeMap Discovery

development of the face Its only remain left is the external auditory meatus. These structures develop from the first pharyngeal arch are two lingual lateral prominences and one in the middle that is does not develop and disappears.

A second prominence, the hypobranchial eminencecomes from the second, third and fourth pharyngeal arches. A third prominence that comes from the fourth arch develops the epiglottis. The laryngeal orifice is behind the third prominence, which is surrounded by the arytenoid prominences.

DEVELOPMENT OF THE FACE EPUB

The surcus terminalis linguae is a V shaped line that separates the body of the tongue from the posterior part. The posterior tongue is innervated by the glosopharyngeal nerve.

The muscles of the tongue are innervated by the hypoglossal nerve.

DEVELOPMENT OF THE FACE EPUB

This point later will be the foramen cecum.



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