First Pharyngeal Pouch

The first pharyngeal pouch forms a stalklike diverticulum, the tubotympanic recess, which comes in contact with the epithelial lining of the first pharyngeal cleft, the future external auditory meatus (Fig. 15.10). The distal portion of

Mandibular process

Pharyngeal clefts

Mandibular process

Pharyngeal clefts

Pharyngeal Pouches

Parathyroid gland (inferior)

Parathyroid gland (superior)

Ultimo-branchial body

Figure 15.10 A. Development of the pharyngeal clefts and pouches. The second arch grows over the third and fourth arches, burying the second, third, and fourth pharyngeal clefts. B. Remnants of the second, third, and fourth pharyngeal clefts form the cervical sinus, which is normally obliterated. Note the structures formed by the various pharyngeal pouches.

Parathyroid gland (inferior)

Parathyroid gland (superior)

Ultimo-branchial body

Figure 15.10 A. Development of the pharyngeal clefts and pouches. The second arch grows over the third and fourth arches, burying the second, third, and fourth pharyngeal clefts. B. Remnants of the second, third, and fourth pharyngeal clefts form the cervical sinus, which is normally obliterated. Note the structures formed by the various pharyngeal pouches.

the diverticulum widens into a saclike structure, the primitive tympanic or middle ear cavity, and the proximal part remains narrow, forming the auditory (eustachian) tube. The lining of the tympanic cavity later aids in formation of the tympanic membrane or eardrum (see Chapter 16).

Was this article helpful?

+1 0
Hair Loss Prevention

Hair Loss Prevention

The best start to preventing hair loss is understanding the basics of hair what it is, how it grows, what system malfunctions can cause it to stop growing. And this ebook will cover the bases for you. Note that the contents here are not presented from a medical practitioner, and that any and all dietary and medical planning should be made under the guidance of your own medical and health practitioners. This content only presents overviews of hair loss prevention research for educational purposes and does not replace medical advice from a professional physician.

Get My Free Ebook


Responses

  • Lavinia
    What is pharyngeal pouch?
    8 years ago
  • BRIFFO
    Where in the body is a pharageal pouch?
    8 years ago
  • everard
    What forms first pharyngeal pouch?
    8 years ago

Post a comment