Pharyngeal Arch Derivatives Flashcards
Nerves of the pharyngeal arches?
1 - Trigeminal - mandibular
2 - Facial
3 - Glosspharyngeal
4 ,6 - Vagus
What arteries are associated with the pharyngeal arches?
1-3 - common carotid/ECA/ICA
4 - Aortic arch
Right subclavian
6 - Pulmonary A
What muscles develop from arch 1
Muscles of mastication Anterior belly of digastric. Mylohyoid Tensor tempani Tensor celi palatine
What muscles develop from arch 2
Muscles of facial expression Post belly of digastric Stylohyoid Stapedius External auricular muscles
Muscles from 3?
Stylopharyngeus
Muscles from 4-6?
Striated muscle of upper oesophagus Cricothyroid Levator palatine Pharynx constrictors and cricothyroid - 4 Intrinsic larynx muscles - 6
What is the 4th arch vagus branch? 6th?
4 = superior laryngeal 6 = recurrent laryngeal
Skeletal derivative of arch 1
Neural crest cells –> cartilage bar
Divides into maxillary and mandibular prominences
Mandibular prominence –> Meckel’s cartilage
Malleus and incus
Mandible
Skeletal dereivatives of arch 2
Reichart’s cartilage
Stapes
Styloid process of temporal bone
Hyoid bone (lesser cornu and upper body)
Skeletal derivatives of arch 3
Hyoid bone (greater cornu and lower body)
Skeletal derivatives of arch 4
Epiglotis
Skeletal derivatives of 4th/6th arch
Laryngeal cartilages: Epiglottis Thyroid Paired arytenoid Cricoid
Derivative of 1st pouch
Eustachian tube and middle ear cavity
Derivatives of pouch 2
Crpts of palatine tonsils (colonised by lymphoid precursors)
Derviatives of pouch 3
Inferior parathyroid (dorsal)
Thymus (ventral)
