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The third pouch possesses dorsal and ventral wings. Derivatives of the dorsal wings include the inferior parathyroid glands, while the ventral wings fuse to form the cytoreticular cells of the thymus. The main nerve supply to the derivatives of this pouch is cranial nerve IX, glossopharyngeal nerve.
I-IV pharyngeal arches, 1–4 pharyngeal pouches (inside) and/or pharyngeal grooves (outside) a Tuberculum laterale b Tuberculum impar c Foramen cecum d Ductus thyreoglossus e Sinus cervicalis. The pharyngeal apparatus is an embryological structure. [1] [2] It consists of: pharyngeal grooves (from ectoderm) pharyngeal arches (from mesoderm)
The first pharyngeal arch, also mandibular arch (corresponding to the first branchial arch of fish), is the first of six pharyngeal arches that develops during the fourth week of development. [10] It is located between the stomodeum and the first pharyngeal groove .
The first pharyngeal groove produces the external auditory meatus (ear canal). [2] The rest (2, 3, and 4) are overlapped by the growing second pharyngeal arch, and form the floor of the depression termed the cervical sinus, which opens ventrally, and is finally obliterated.
punching out holes in bones or other tissues •Henckle's punch forceps: punching out holes in bones or other tissues Eustachian (tube) catheter: on certain procedures of the eustachian tube or the middle ear like patency test; inflate middle ear and clear eustachian tube blockade; removal of foreign body of the nose; as a suction cannula. Mirrors
Bilateral branchial cleft sinuses during surgery. Four branchial clefts (also called "grooves") form during the development of a human embryo. The first cleft normally develops into the external auditory canal, [8] but the remaining three arches are obliterated and have no persistent structures in normal development. Persistence or abnormal ...
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A Killian-Jamieson diverticulum is very similar to a pharyngeal esophageal diverticulum, differing in the fact that the pouching is between the oblique and transverse fibers of the cricopharyngeus muscle. [7] A Laimer diverticulum is an outpouching that occurs in the Laimer triangle between the cricopharyngeus and superior esophageal circular ...