Lecture 10 Flashcards
(21 cards)
What are the 3 layers formed in the fetus during first 3 weeks of development?
1) Endoderm
2) Ectoderm
3) Mesoderm
What does the Endoderm form?
Internal epithelium
What does the Ectoderm form?
- External epithelium
- Nervous system
- Enamel
What does the Mesoderm form?
- Bones
- Muscles
- Dentine
What is the nerve supply to the 1st Pharyngeal Arch?
Trigeminal- Mandibular division
What is the nerve supply to the 2nd Pharyngeal Arch?
Hyoid - Facial
What is the nerve supply to the 3rd Pharyngeal Arch?
Glossopharyngeal
What is the nerve supply to the 4th Pharyngeal Arch?
Vagus
What cartilage surrounds the 1st PA?
Meckel’s Cartilage
What structure is formed by 1st PA?
Mandible
What muscles are formed by 1st PA?
- Muscles of mastication
- Mylohyoid muscle
- Anterior belly of digastric
- Tensor palati
What cartilage surrounds the 2nd PA?
Reichert’s Cartilage
What structures are formed by 2nd PA?
- Styloid process
- Body & lesser horn of hyoid
What muscles are formed by 2nd PA?
- Muscles of facial expression
- Posterior belly of digastric
What structure is formed by 3rd PA?
Greater horn of hyoid
What cartilage surrounds the 4th and 6th PA?
- Thyroid
- Cricoid
- Arytenoid
What does the 1st pouch develop into?
Middle ear
What does the 2nd pouch develop into?
Palatine tonsil
What does the 3rd pouch develop into?
Inferior parathyroid gland
What does the 4th and 6th pouch develop into?
Superior parathyroid gland
What does the 1st pharyngeal cleft become?
External Auditory Meatus
