Branchial arch derivatives

Question 1

Branchial arch 1 cartilage

Answer 1

Meckel’s cartilage: mandible, malleus, incus, spheno-Mandibular ligament
(M’s)

Question 2

Branchial arch 1 muscle

Answer 2

Muscles of mastication: temporalis, masseter, lateral and medial pterygoids
Mylohyoid, anterior belly of digastric, tensor tympanim tensor veli palatini
(M’s)

Question 3

Branchial arch 1 nerve

Answer 3

CN V2 and V3

Question 4

Branchial arch 1 abnormality

Answer 4

Treacher Collins syndrome: 1st neural crest fails to migrate->mandibular hypoplasia, facial abnormalities

Question 5

Branchial arch 2 cartilage

Answer 5

Reichert cartilage: Stapes, styloid process, lesser horn of hyoid, stylohyoid ligament
(S’s)

Question 6

Branchial arch 2 muscle

Answer 6

Muscles of facial expression: Stapedius, stylohyoid, platySma, posterior belly of diagastric (S’s)

Question 7

Branchial arch 2 nerve

Answer 7

CN VII (Smile)

Question 8

Branchial arch 2 abnormality

Answer 8

Congenital pharyngocutaneous fistula-persistence of cleft and pouch–>fistula between tonsillar area and lateral neck

Question 9

Branchial arch 3 cartilage

Answer 9

Greater horn of hyoid

Question 10

Brachial arch 3 muscle

Answer 10

Stylopharyngeus

Question 11

Branchial arch 3 nerve

Answer 11

CN IX

Question 12

Branchial arch 4-6 cartilage

Answer 12

thyroid, cricoid, arytenoids, corniculate, cuneiform

Question 13

Branchial arch 4-6 muscle

Answer 13

4-most pharyngeal constrictors, cricothyroid, levator veli palatini
6- all intrinsic muscles of larync except cricothyroid

Question 14

Branchial arch 4-6 nerve

Answer 14

4-CN X (superior laryngeal branch) simple swallow

6-CN X (recurrent laryngeal branch) speak

Question 15

Branchial arch derivatives mnemonic

Answer 15

Chewing(1) made me Grimace(2) so i Swallowed(3), Choked(4) and Cried(6) for help