High-Yield Embryology 2nd by Ronald W. Dudek

By Ronald W. Dudek

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In addition, pharyngeal pouch 1, pharyngeal membrane 1, and pharyngeal groove I are shown to give rise to structures of the adult ear. 2 = pharyngeal pouch 2; 3 = pharyngeal pouch 3; 4 = pharyngeal pouch 43 . General sensation from the mucosa is carried by the lingual branch of the trigeminal nerve (CN V). 4 - Taste sensation from the mucosa is carried by the chorda tympani branch of the facial nerve (CN VII). B . Posterior third (pharyngeal part) of the tongue I The posterior third of the tongue forms from the copula and hypobranchial emi , nence, which is associated with pharyngeal arches 2 3, and 4- The hypobranchial eminence overgrows the copula, thus eliminating any contribution of pharyngeal arch 2 in the formation of the definitive adult tongue.

Pharyngeal arch 5 degenerates in humans. 60 Head and Neck A 61 Maxillary and mandibular prominence of 1 t us Level of section B B Foregut Auditory tube and Foramen middle ear cavity cecum (pharyngeal pouch 1) Externa auditory meatus (pharyngeal groove 1) Tympanic membrane SP (pharyngeal membrane 1) UB Thyroid gland o P T Figure 11-1. (A) Lateral view of an embryo in week 4 of development, showing the pharyngeal arches. Note that pharyngeal arch I consists of a maxillary and mandibular prominence, which may cause some confusion in numbering of the arches.

It results from retarded growth of one of the para- mesonephric ducts. 4 Atresia of the vagina is a condition in which the vaginal lumen is blocked. It results from failure of the vaginal place to canalize and form a lumen. When only the inferior part of the vaginal plate fails to canalize, a condition known as imperforate hymen occurs. 5 Absence of uterus and vagina results from the failure of the paramesonephric ducts and the sinovaginal bulbs to develop. . 50 A . Chapter 9 Formation of the Uterus and Vagina tfl \ Gonads Gonads Paramesonephric Paramesonephric duct duct Uterovaginal primordium Vaginal plate Sinovaginal bulb B .

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