Branchial Arch derivative

Question 1

First Arch name

Answer 1

Mandibular Arch

Question 2

First arch nerve

Answer 2

Trigeminal nerve (mandibular branch)

Question 3

First arch muscles

Answer 3

Muscles of mastication (masseter, temporalis, medial and lateral pterygoids), mylohyoid, ant. belly of digastric, tensor veli palatani, tensor tympani

Question 4

First arch skeletal

Answer 4

head of malleus
upper part of incus
meckel’s cartilage

Question 5

First arch artery

Answer 5

maxillary artery

external carotid artery

Question 6

Second arch name

Answer 6

hyoid arch

Question 7

second arch nerve

Answer 7

facial nerve

Question 8

second arch muscles

Answer 8

facial expression
stapedius
stylohyoid
posterior belly of digastric

Question 9

skeleton of second arch

Answer 9

handle of malleus
lower part of incus
stapes
styloid process
lesser cornu/upper body hyoid

Question 10

artery of second arch

Answer 10

stapedial artery

Question 11

third arch nerve

Answer 11

glossopharyngeal nerve CN IX

Question 12

third arch muscle

Answer 12

stylopharyngeus

Question 13

third arch skeleton

Answer 13

greater cornu lower body of hyoid

Question 14

third arch artery

Answer 14

proximal part of common carotid

distal part of internal carotid

Question 15

fourth arch nerve

Answer 15

Vagus Nerve

Question 16

fourth arch muscles

Answer 16

Cricothyroid
Salpingopharyngeus
Palatopharyngeys
superior, middle, inferior vegetarian
Levator veli palatani
palatoglossus

Question 17

fourth arch skeletal

Answer 17

laryngeal cartilages (thyroid cartilage)

Question 18

fourth arch artery

Answer 18

aortic arch

R. subclavian arch

Question 19

5/6 arch nerve

Answer 19

cranial root of spinal accessory nerve via RLN

Question 20

5/6 arch muscle

Answer 20

everything for fourth arch except cricothyroid

all intrinsic muscles of larynx

Question 21

5/6 arch skeletal

Answer 21

laryngeal cartilages except thyroid cartilage

Question 22

5/6 arch arteries

Answer 22

ductus arteriosus

proximal pulmonary artery

Question 23

first pouch

Answer 23

ear stuff:
eustachian tube
middle ear cavity
mastoid antrum

Question 24

second pouch

Answer 24

crypts of palatine fossa

Question 25

third pouch

Answer 25

inferior parathyroid glands

thymus

Question 26

fourth pouch

Answer 26

superior parathyroid glands

C cells of thyroid glands

Question 27

First groove

Answer 27

External acoustic meatus

Question 28

2-4 groove

Answer 28

common cervical sinus, typically obliterates. Can turn into branchial sinus which is pathology

Question 29

first membrane

Answer 29

tympanic membrane

Question 30

thyroid development pathology

Answer 30

descends through tongue into neck
starts at foramen cecum
can create:
persisting thyroglossal duct
pyramidal lobes
persistant thyroglossal ducts
thyroglossal cysts/sinuses
ectopic thyroid glands