Floor Of Pharynx Derivatives

It has the form of a tube with an expanded end.

Floor of pharynx derivatives.

Thyroid gland the thyroid gland begins as a downgrowth of the floor of the pharynx called the thyroid diverticulum. The pharyngeal derivatives b. The entrance to this tube is the glottis and the region about it becomes the larynx. A hollow lung bud grows off the floor of the endodermal pharynx just caudal tailward to the pharyngeal pouches and in the midline.

Median tongue bud called the tuberculum impar does form but is overgrown by the lateral tongue buds and thus disappears v. Buds arise in the mesoderm of the floor of the pharynx opposite or next to the pharyngeal arch 1 iii. Buds fuse in the midline which is represented by the median sulcus and septum of the tongue iv. Musculature and cartilage of larynx along with the sixth pharyngeal arch.

The tongue buds are then invaded by occipital myoblasts that form the intrinsic muscles of the tongue. In the adult a remnant of this duct persists in the tongue as the foramen cecum. The tube proper represents the trachea or windpipe. The anterior 2 3 of the tongue is derived from median and lateral tongue buds that arise from the floor of the 1st pharyngeal arch and then grow rostrally.

Due to the precocity of their development the intrusion of the tracheo pulmonary anlage within the floor of the pharynx is a most marked feature. Superior parathyroid glands and ultimobranchial body which forms the parafollicular c cells of the thyroid gland. As it descends down the neck it remains connected to the tongue via the thyroglossal duct.