Derivatives Of Mesoderm
DERIVATIVES OF MESODERM
- Mesoderm is divided into three parts:-
1) Paraxial mesoderm 2) Intermediate mesoderm 3) Lateral plate mesoderm
1. PARAXIAL MESODERM:
- It is organised into somites which in turn gives rise to:-
- Sclerotomes: Forms axial skeleton including vertebrae, ribs and parts of neurocranium.
- Myotomes: Form all voluntary (skeletal) muscles of head, trunk and limbs.
- Dermatomes: Form dermis of skin, especially over dorsal regions.
2. INTERMEDIATE MESODERM:
- It gives rise to major portion of urogenital system:-
- Urinary organs: Kidney, ureters, trigone of bladder, posterior wall female urethra, posterior wall of upper half of prostatic part of male urethra, inner glandular zone of prostate.
- Reproductive organs: Gonads (testis and ovary), epididymis, ducts deferens, seminal vesicle, ejaculatory duct, uterus, uterine tube and upper part of vagina.
3. LATERAL PLATE MESODERM:
- It forms:-
i) Somatopleuric mesoderm (parietal layer)
- All connective tissues including specialised connective tissue like bone, cartilage, adipose tissue.
- Dermis of skin over ventrolateral body wall and limbs.
- Superficial and deep fascia.
- Ligaments, tendons, aponeurosis.
- Parietal pleura, parietal peritoneum and tunica vaginalis of testis.
- Dura-mater.
- Lid muscles, extraocular muscles.
- Sclera, choroid, vitreous.
- Corneal stroma, iris and ciliary body (except epithelium).
ii) Splanchnopleuric mesoderm (visceral layer)
- Smooth muscle and connective tissue of respiratory tract, gut, blood vessels and heart.
- Adrenal cortex.
- Mesothelium (visceral layer) of pleural, peritoneal and pericardeal cavities.
- Mesenchyme surrounding pericardial coelom gives rise to myocardium and serous pericardium.
- Spleen and lymph nodes.
iii) Spetum transversum
- Diaphragm
- Fibrous pericardium
iv) Angiogenic mesoderm
- Endocardium of heart
- Endothelium of blood and lymphatic vessels.
- Microglia, tissue macrophage.
- Circulating blood vessels.
Exam Question
DERIVATIVES OF MESODERM
- Mesoderm is divided into three parts:-
1) Paraxial mesoderm 2) Intermediate mesoderm 3) Lateral plate mesoderm
1. PARAXIAL MESODERM:
- It is organised into somites which in turn gives rise to:-
- Sclerotomes: Forms axial skeleton including vertebrae, ribs and parts of neurocranium.
- Myotomes: Form all voluntary (skeletal) muscles of head, trunk and limbs.
- Dermatomes: Form dermis of skin, especially over dorsal regions.
2. INTERMEDIATE MESODERM:
It gives rise to major portion of urogenital system:-
- Urinary organs: Kidney, ureters, trigone of bladder, posterior wall female urethra, posterior wall of upper half of prostatic part of male urethra, inner glandular zone of prostate.
- Reproductive organs: Gonads (testis and ovary), epididymis, ducts deferens, seminal vesicle, ejaculatory duct, uterus, uterine tube and upper part of vagina.
3. LATERAL PLATE MESODERM:
- It forms:-
i) Somatopleuric mesoderm (parietal layer)
- All connective tissues including specialised connective tissue like bone, cartilage, adipose tissue.
- Dermis of skin over ventrolateral body wall and limbs.
- Superficial and deep fascia.
- Ligaments, tendons, aponeurosis.
- Parietal pleura, parietal peritoneum and tunica vaginalis of testis.
- Dura-mater.
- Lid muscles, extraocular muscles.
- Sclera, choroid, vitreous.
- Corneal stroma, iris and ciliary body (except epithelium).
ii) Splanchnopleuric mesoderm (visceral layer)
- Smooth muscle and connective tissue of respiratory tract, gut, blood vessels and heart.
- Adrenal cortex.
- Mesothelium (visceral layer) of pleural, peritoneal and pericardeal cavities.
- Mesenchyme surrounding pericardial coelom gives rise to myocardium and serous pericardium.
- Spleen and lymph nodes.
iii) Spetum transversum
- Diaphragm
- Fibrous pericardium
iv) Angiogenic mesoderm
- Endocardium of heart
- Endothelium of blood and lymphatic vessels.
- Microglia, tissue macrophage.
- Circulating blood vessels.
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