embryo exam 3 review

7/27/2019 Embryo Exam 3 Review

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Pharyngeal Arches



Pharyngeal Arches

1. The Pharyngeal or Branchial apparatus forms during the _____ week.

2. The branchial apparatus consists of four main things, which are?

3. By the end of the fourth week there are ____ visible arches.

4. The first pharyngeal arch forms two prominences, which are?

5. Between the two parts of the first arch there develops a thin membranethat rupture called the _______.

6. Each arch is lined externally by _____, internally by _____ and has a core

of mesenchyme derived from _____ and _____.

7. A typical pharyngeal arch contains what four things? Note the difference

from question 2.



Pharyngeal Arches

1. Derivatives of the First arch:a. Cartilage:

b. Muscle:

c. Nerve:

2. Derivatives of the Second arch:a. Cartilage:

b. Muscle:c. Nerve:

3. Derivatives of the Third arch:a. Cartilage:

b. Muscle:

c. Nerve:

4. Derivatives of the Fourth arch:

a. Cartilage:b. Muscle:

c. Nerve:

5. Derivatives of the Sixth arch:a. Cartilage:

b. Muscle:

c. Nerve:

Actually type out your answers to practice NOOB!



Pharyngeal Arches

1. The nerves of the second through sixth arch have very little cutaneouscontribution, but instead give _____ innervation to the mucosa of thetongue, oral and nasal cavities, larynx and pharynx.

2. First pharyngeal pouch forms?

3. Second pharyngeal pouch forms?

4. Third pharyngeal pouch forms?5. Fourth pharyngeal pouch forms?

6. Fifth pharyngeal pouch forms?

7. The pharyngeal grooves form on the outside of the embyro. They form twomain structures from the first pair of grooves and last set of grooves. What

are the structures?8. The thyroid gland forms at the pharynx (near tongue) and descends to the

neck forming the thyroglossal duct. What day does the gland form?

9. There is a pyramidal thyroid lobe in __% of people which is a remnant of the ______.



Pharyngeal Arches

1. Patient presents with a small pin size opening on the side of neck with fluidcoming from it. Diagnosis? Cause?

2. Pharyngeal cartilages disappear; remnants of cartilage or bony elements areevident under skin anterior to the inferior 1/3 of SCM. Diagnosis?

3. Patient presents with a mass near the base of the tongue. There are no

abnormal levels of thyroid hormones. Diagnosis?4. Patient presents with a mass in the midline of her neck. After palpation you

notice it is not hard but instead feels fluid filled. Diagnosis?

5. Patient presents with hypoplasia of mandible, face; malformation of ears,eyelid defects, and faulty dentition. Diagnosis and Cause?

6. Patient presents with micrognathia, cleft palate, and external ear defects.Diagnosis and cause?

7. Patient presents with abnormalities of the heart, no parathyroid glands, lowset ears, small jaw bone, and thymus. Diagnosis?

8. What do Treacher Collins, Robins, and DiGeorge have in common?



Pharyngeal Arches

1. During the __ week the median tongue bud develops from the floor of

the pharynx just rostral to the foramen cecum.

2. The two distal tongue buds and the median tongue bud form the ___ of

the tongue.

3. The posterior portion of the tongue forms from the ___ and ____.4. The _____ marks the division of the posterior and anterior portion of

tongue.

5. Sensation to tongue: somatic to anterior 2/3 ___, visceral to posterior

1/3 ____, sensory to posterior 1/3, carries taste from root of tongue ___.

6. Abnormally short frenulum that anchors tongue to floor of oral cavity iscalled?

embryo exam 3 review

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