The pharyngeal pouches There are five pairs of

  • Slides: 13
Download presentation
• The pharyngeal pouches: • There are five pairs of pouches, the 5

• The pharyngeal pouches: • There are five pairs of pouches, the 5 th is considered as a part of the forth. derivatives of these pouches include: • 1 st pouch produces tympanic cavity and Eustachian tube.

• The 2 nd pouch produces palatine tonsils. • The 3 rd pouch

• The 2 nd pouch produces palatine tonsils. • The 3 rd pouch produces the inferior parathyroid gland & thymus. • 4 th pouch produces superior parathyroid gland. • The 5 th pouch produces ultimobranchial body forms parafollicular C-cells of thyroid gland.

• The pharyngeal clefts: • These are 4 clefts that develop at 5

• The pharyngeal clefts: • These are 4 clefts that develop at 5 th wk, • 1 st cleft forms external auditary meatus & outer epithelium of eardrum. • The mesenchyme of the 2 nd pharyngeal arch grows & overlaps 3 rd & 4 th arches leading to closure of the 2 nd, 3 rd, and 4 th clefts from out side to form cervical sinus that disappears later on.

• Clinical notes: • 2 nd pharyngeal arch may fails to grow caudally

• Clinical notes: • 2 nd pharyngeal arch may fails to grow caudally and thus fails to cover the 2 nd, 3 rd, and 4 th clefts, a narrow canal called the branchial fistula connects them with surface just ant. to sternomastoid m. The cavity( lateral cervical cyst) lies below the angle of the mandible. This cyst is visible clearly during childhood.

• The tongue: • Bilateral lingual swellings and a median swelling (tuberculum impar)

• The tongue: • Bilateral lingual swellings and a median swelling (tuberculum impar) are formed from 1 st pharyngeal arch. • Also 2 nd, 3 rd, and 4 th arches form another median hypobranchial eminence called copula. • Finally, a third median swelling is formed by 4 th arch forming epiglottis anterior to orifice of larynx.

• Lateral lingual swellings overgrow tuberculum impar forming the ant. 2/3 or body

• Lateral lingual swellings overgrow tuberculum impar forming the ant. 2/3 or body of the tongue that is supplied by the mandibular branch of trigeminal N. which is N. of 1 st arch.

• posterior part (root) of tongue is separated by V-shaped sulcus terminalis from

• posterior part (root) of tongue is separated by V-shaped sulcus terminalis from body & is derived from 2 nd, 3 rd, 4 th arches. • Root supplied by 9 th cranial nerve of 3 rd arch

• Extreme posterior part of tongue is supplied by the superior laryngeal branch

• Extreme posterior part of tongue is supplied by the superior laryngeal branch of vagus of the 4 th arch. • Most of muscles of the tongue are from occipital somites and thus are supplied by the 12 th cranial nerve.

Pharyngeal Arches Clefts Pouches The pharyngeal apparatus isPharyngeal Arches Clefts Pouches The pharyngeal apparatus is
Pharyngeal Arches Pouches and GroovesClefts Dr Mujahid KhanPharyngeal Arches Pouches and GroovesClefts Dr Mujahid Khan
Pharyngeal Arches Pouches and Clefts By Dr MujahidPharyngeal Arches Pouches and Clefts By Dr Mujahid
Development of pharyngeal apparatus pharyngeal arches and itsDevelopment of pharyngeal apparatus pharyngeal arches and its
COLLABORATIVE PAIRS WHAT IS COLLABORATIVE PAIRS Collaborative pairsCOLLABORATIVE PAIRS WHAT IS COLLABORATIVE PAIRS Collaborative pairs
THERE IS THERE ARE THERE WAS THERE WERETHERE IS THERE ARE THERE WAS THERE WERE
There is There are There isthere are ThereThere is There are There isthere are There
THERE IS THERE ARE There is and thereTHERE IS THERE ARE There is and there
There is There are There is there areThere is There are There is there are
THERE IS THERE ARE There is There areTHERE IS THERE ARE There is There are
There is There are There is there areThere is There are There is there are
THERE IS THERE ARE There is Singular ThereTHERE IS THERE ARE There is Singular There