Congenital lesions of the face Flashcards
Pharyngeal arches
- Description
- Time of development
- Develops into…
First structure that support the lateral walls of the primordial pharynx
Arise from the neural crest cells at week 4
- 4 pairs
- Each arch is separated by pharyngeal grooves
Develops into
- Face
- Nasal cavities
- Mouth
- Larynx, Pharynx
- Neck
Stomodeum
- Description
- Surrounding structure
- Develops into what?
Primordial mouth
- Slight depression on the surface of the ectoderm
Separated from primordial pharynx by oropharyngeal membrane
- Precursor of the mouth and anterior pituitary
First pharyngeal arch
Mandibular arch
Develops into mandibular and maxillary process/ prominence
Second pharyngeal arch
Hyoid arch
Develops to the body of hyoid bone
Components of an arch
Aortic arch artery
- Branch from primordial heart via truncus arteriosus
Cartilage
- Skeleton of the arch
Muscle/ mesoderm
- Forms mesoderm of the head and neck
Nerve
- Supplies mucosa and muscles
Meckel’s cartilage
- Include ligament
Cartilage of the first arch
Forms middle ear bones
- Malleus and incus
Rest of the cartilage
- Sphenomandibular ligament
Second arch cartilage
- Develops into.. (4)
Develops into
- Stapes (middle ear)
- Styloid process
- Stylohyoid ligament
- Lesser horn of hyoid
Third cartilage differentiation
Greater horn of the hyoid
Origin of the laryngeal cartilage
Formed from the fusion of the fourth and firth cartilage
- Includes thyroid and cricoid cartilage.
- Except epiglottis.
Muscles of the first arch
Muscles of mastication
- Masseter
- Medial and lateral pterygoid
- Temporalis
Mylohyoid
Anterior belly of diagstric
Nerve of the first arch
Trigeminal nerve
Nerve of the hyoid arch
Facial nerve
Muscles of the hyoid arch
Muscles of facial expression
Posterior digastric
Stapedius
Third arch nerve
Glossopharyngeal
Third arch muscle
Stylopharyngeus
