Pharyngeal Apparatus: Birth Defects

Question 1

Birth defects

Answer 1

1. Ectopic thymic and parathyroid tissue
2. Cervical (branchial) cyst
3. External cervical (branchial) fistula
4. Internal cervical (branchial) fistula

Question 2

Ectopic thymic and parathyroid tissue

Answer 2

Thymus may remain in neck inferior parathyroid is more variable in position than the superior

Question 3

Cervical cyst

Answer 3

Cystic swelling lying anywhere along sternomastoid anterior border, resulting from failure of cervical sinus obliteration

Question 4

External cervical fistula

Answer 4

Branchial cyst opens externally into skin

Question 5

Internal cervical fistula

Answer 5

Branchial cyst opens internally into pharynx