pharyngeal pouch

Pharyngeal pouches develop into future parts in face and head.

The first pharyngeal pouch is characterized by narrowing at its final segment.

They arise during fetal development from structures known as the third and fourth pharyngeal pouch.

The last one produces with a pharyngeal pouch.

The thymus arises as an outgrowth of the third pharyngeal pouch.

It is formed from the tubotympanic recess, an expansion of the first pharyngeal pouch.

Musculature and cartilage of larynx (along with the sixth pharyngeal pouch).

The third pharyngeal pouch will give rise to the inferior parathyroid gland and thymus.

The middle ear, which includes the tympanic cavity and the auditory tube, originates from the first pharyngeal pouch.

The Eustachian tube is derived from the first pharyngeal pouch, which during embryogenesis forms the tubotympanic recess.

Another possible explanation for the small bones is that they were originally located in the throat and were pushed into the pharyngeal pouch during fossilization.

Pharyngeal pouch can refer to:

Embryologic origin of these C-cells is neural crest, from the ultimobranchial body (4th pharyngeal pouch).

One temnospondyl, the dvinosaur Trimerorhachis, may have brooded young in an area between the gills called the pharyngeal pouch.

These defects occur in areas known as the 3rd and 4th pharyngeal pouches, that later develop into the thymus and parathyroid glands.

Second pharyngeal pouch develops differently from the first one mainly because most of it disappears, leaving the tonsillar fossa(Rohen).

Embryologically, they associate with the ultimobranchial body, which itself is a ventral derivative of the fourth (or fifth) pharyngeal pouch.

Pharyngeal pouch (embryology)

The auricule originates as a fusion of six proliferations or auricular hillocks form the first and second pharyngeal pouches.

Small bones that likely belong to immature Trimerorhachis individuals have been found in the pharyngeal pouches of larger Trimerorhachis specimens.

The first two (malleus and incus) derive from the first pharyngeal pouch and the stapes from the second.

In human embryology, there are six arches which are separated by pharyngeal grooves externally and pharyngeal pouches internally.

The hyomandibular and hyobranchial pharyngeal pouches are visible externally, but they are best seen from below after dissection of the embryo from the yolk.

If this was the case, the bones of these smaller individuals were originally located in the throat and were pushed into the pharyngeal pouch as the animal fossilized.

The thymus appears in the form of two flask-shape diverticula, which arise from the third branchial pouch (pharyngeal pouch) of the endoderm.