Question
Describe T.S. of spinal cord.
✓
Answer
- Externally there are three meninges covering spinal cord Duramater, arachnoid membrane and pia mater.
- Dorsoventrally there are two fissures, the shallow dorsal or posterior fissure and the deeper ventral or anterior fissure.
- From dorsal fissure a dorsal septum extends inside.
- Neurocoel or central canal is situated in the centre of spinal cord.
- The central canal is filled with cerebro¬spinal fluid and is lined by cuboidal epithelial cells called layer of ependyma.
- There is inner grey and outer white matter in the spinal cord. This grey matter is in the shape of ‘H’ with two dorsolateral horns and two ventro-lateral horns.
- Dorsal horns form dorsal roots and ventral horns form ventral roots.
- White matter is divided into three columns, viz., the dorsal funiculi, ventral funiculi and lateral funiculi on either side.
- Ascending and descending tracts of nerve fibres arise from dorsal and ventral roots of the spinal cord. Ascending tracts are sensory while descending tracts are motor in nature.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
We are able to hear the chirping of the birds and recognize the sound of the bird.
In a person, Pars distalis part of the Pituitary gland is not producing hormones in sufficient quantity. Explain the effects it will produce with respect to the different hormones.###Give names and functions of hormones secreted by adenohypophysis.
Draw a labelled diagram of the sectional view of a mature pollen grain in angiosperms. Explain the functions of its different parts.
What are the preventive measures against ascariasis?
Unless the vector and source DNAs are cut, fragments separated and joined, the desired recombinant vector molecules cannot be created.
- How are the desired DNA sequences cut?
- Explain the technique used to separate the cut fragments.
- How are the resultant fragments joined to the vector molecule?
State and explain the 'Law of Independent Assortment' with a suitable example.
Mission Harit Maharashtra.
The graph shows species-area relationship:
→- If b denotes the relationship on log scale-
- Describe a and b.
- How is slope represented? Give the normal range of slope.
- What kind of slope will be observed for frugivorous birds and mammals in a tropical forest?
- Species diversity of plants $(22 \%)$ is much less than that of animals $(72 \%)$. Analyze the reasons for greater diversity of animals as compared to plants.
We are told that evolution is a continuing phenomenon for all living things. Are humans also evolving? Justify your answer.
Your school has been selected by the Department of Education to organise and host an interschool seminar on 'Reproductive Health-Problems and Practices'. However, many parents are reluctant to permit their wards to attend it. Their argument is that the topic is 'too embarrassing'. Put forth four arguments with appropriate reasons and explanations to justify the topic to be very essential and timely.