Brachial pharyngeal apparatus

Question 1

What is Cleft, Art, Pouch derived from

Answer 1

Cleft= ectoderm
Arches= mesoderm +neural crest
Puches= endoderm

Question 2

1st Cleft develops into

Answer 2

External auditory meatus

Question 3

2nd, 3rd, 4th cleft develops into

Answer 3

temporary cervical sinus

Question 4

Failure of obliteration of pharyngeal cyst

Answer 4

Pharyngeal cleft cyst
Lateral neck
immobile w/ swallowing

Question 5

How to distinguish pharyngeal cyst from thyroglossal duct cyst

Answer 5

Thyroglossal duct cyst: moves w/ swallowing, midline

Pharyngeal cleft cyst : Lateral neck, immobile w/ swallowing

Question 6

1st pharyngeal pouch

Answer 6

Middle ear
eustachian tubes
Mastoid air cells

Question 7

2nd pharyngeal pouch

Answer 7

epithelial lining of tonsils

Question 8

3rd pharyngeal pouch

Answer 8

inferior parathyroid glands

Thymus

Question 9

4th pharyngeal poud

Answer 9

Superior parathyroid glands

Question 10

DiGeorge syndrome

Answer 10

no 3rd or 4th pharyngeal pouch
thymic aplasia
T cell deficiency
hypocalcemia

Question 11

1st Arch

Answer 11

M’s & T’s
Cartilage: Mecekl’s cartilage: mandible, mandibular ligament, malleus & incus

Muscle: Muscles of Mastication: masseter, medial pterygoid, lateral pterygoid, Temporalis