EMBRYOLOGY & FETAL DEVEOPMENT

Question 1

The auricle is adult shaped by __________

Answer 1

week 20

Question 2

Sensory receptor cells are formed at _________.

Answer 2

12 weeks

Question 3

The auricle begins to develop at ____

Answer 3

Week 3-4

Question 4

Meatal plug disintegrates to expose the tympanic membrane at ________

Answer 4

Week 21

Question 5

cochlear portion of the inner ear matures_____ than the vestibular portion, thus it subject to greater chances of developmental ____________.

Answer 5

1. later

2 deviations and malformations.

Question 6

Endoderm Primordial Tissue

Answer 6

Middle ear cavity, Eustachian tube, medial layer of the tympanic membrane.

Question 7

What are the stages of Gestation

Answer 7

1. Embryo= first 8 weeks of gestation
2. Fetus =beyond 8weeks
3. Premature =earlier than 38 weeks
4. Postmature=beyond 42 weeks

Question 8

1st turn of the cochlea is formed at__________

Answer 8

7 weeks

Question 9

Ectoderm Primordial Tissue

Answer 9

Outer ear, lateral layer of the tympanic membrane, membranous labyrinth, organ of Corti.

Question 10

Mesoderm Primordial Tissue

Answer 10

Ossicles, temporal bone, fibrous layer of the tympanic membrane.

Question 11

Complete maturation of the cochlear sensory receptor and supporting cells does not occur until

Answer 11

20 weeks

Question 12

Auricle moves dorsolaterally at ______

Answer 12

Week 7