DEVELOPMENT (ARCHES)

Question 1

anomalous development of external acoustic meatus?

Answer 1

problem with 1st pharyngeal cleft

Question 2

Difference between 1st arch and 2nd arch?

Answer 2

1st arch: incus & malleus

2nd arch: stapes

Question 3

Meckel’s cartilage makes what?

Answer 3

malleus & Incus (1st Branchial Arch)

Question 4

The mandible is ________ to Meckel’s cartilage in development?

Answer 4

Lateral

Question 5

Hyoid bone develops from which arch?

Answer 5

2nd arch & 3rd arch

Question 6

Buccinator muscle develops from which arch?

Answer 6

2nd Arch

Question 7

Describe Reichert’s cartilage ?

Answer 7

2nd arch, makes stapes bone, styloid process, stylohyoid, CN VII

Question 8

Inferior parathyroid is from ?

Answer 8

3rd Pouch

Question 9

Thymus gland is from ?

Answer 9

3rd & 4th brachial pouches

Question 10

What develops from Rathke’s pouch (ectoderm)?

Answer 10

Anterior pituitary (adenohypophysis)

Question 11

Philtrum of the lip is formed from

Answer 11

medial nasal processes & maxiallary processes

Question 12

unilateral cleft lip is caubsed by the ?

Answer 12

maxillary prominences on the affected side joining with the merged medial nasal prominence

Question 13

What forms the palate?

Answer 13

Fusion of Intermaxillary & Palatal Shelves

Question 14

Macrostomia (large mouth) is failure of fusion of ?

Answer 14

maxillary & mandibular process

Question 15

What structure in brachial arches failed if baby has bifurcated tongue?

Answer 15

Tuberculum impar

Question 16

Hypoglossal nerve (CN 12) comes from ?

Answer 16

occipital somites (not pharyngeal arches)

Question 17

Which one comes from the upper layer of the neural tube?

Answer 17

Ascending Sensory Pathway

Question 18

Describe ascending tracts?

Answer 18

the pathways by which sensory information from the peripheral nerves is transmitted to cerebral cortex

Question 19

What does Ascending tract consists of?

Answer 19

consist of dorsal colum-medial lemniscal pathway (fine touch/ proprioception) & anterior / lateral spinothalamic tract

Question 20

Origin of the pons & medulla

Answer 20

Rhombencephalon (hindbrain, includes: medulla, pons, & cerebellum)

Question 21

What are the 3 primary vesicles?

Answer 21

Prosencephalon + Mesencephalon + Rhombencephalon

Question 22

What is the pons derived from?

Answer 22

Metencephalon (pons & cerebellum)

Question 23

What are the 5 secondary vesicles?

Answer 23

Telencephalon + Diencephalon + Mesencephalon + Metencephalon + Myelencephalon