What is the internal structure of the medulla oblongata?
What is the internal structure of the medulla oblongata?
The medulla is divided into two main parts: the ventral medulla (the frontal portion) and the dorsal medulla (the rear portion; also known as the tegmentum). The ventral medulla contains a pair of triangular structures called pyramids, within which lie the pyramidal tracts.
What are the external and internal features of medulla oblongata explain with diagram?
3 Describe the internal structure of medulla oblongata. 3.1 Transverse sections of the medulla oblongata at the level of pyramidal decussation….Following are the signs and symptoms:
| Structure Involved | Resultant Signs and Symptoms |
|---|---|
| Vestibular Nucleus | Vertigo |
| Inferior cerebellar peduncle | Ipsilateral ataxia |
What is the other name of medulla oblongata?
“Located at the base of the skull, the medulla oblongata is continuous with the spinal cord at the foramen magnum.”…What is another word for medulla oblongata?
| brain | cerebrum |
|---|---|
| upper story | telencephalon |
| skull |
What are the three groups of nuclei in the medulla oblongata?
The respiratory center is a complex group of nuclei located within the pons and medulla oblongata. It consists of three parts: the dorsal respiratory group, ventral respiratory group and pneumotaxic center.
Which of the surface features are associated with the medulla oblongata?
Anatomical features of the medulla oblongata include: Median fissures: Shallow groves located along the anterior and posterior portions of the medulla. Olivary bodies: Paired oval structures on the medulla’s surface that contain nerve fibers connecting the medulla to the pons and cerebellum.
What is medulla anatomy?
Medulla oblongata. Medulla oblongata is the terminal part of the brainstem. It sits in the posterior cranial fossa, below the tentorium cerebelli. The rostral medulla is continuous with the pons superiorly, with which it forms the pontomedullary junction.
What are the functions of medulla oblongata Class 10?
Medulla Oblongata Function
- It relays nerve impulses between the spinal cord and the brain.
- Controls autonomic functions.
- Regulates mood.
- Coordinates movements of the body.
- It is the reflex centre for coughing, vomiting, sneezing, swallowing.
- It is the vasomotor center: baroreceptors.
How big is the medulla oblongata?
The medulla is approximately 3 cm in length and 2 cm in greatest diameter 2. The caudal border of the medulla is the 1st cervical spinal nerves.
What is the full meaning of medulla oblongata?
Definition of medulla oblongata : the part of the vertebrate brain that is continuous posteriorly with the spinal cord and that contains the centers controlling involuntary vital functions — see brain illustration.
Which nucleus is present in medulla oblongata?
All the nuclei are bilaterally distributed, meaning that there is one nucleus on either side of the midline. Going from medial to lateral, and from dorsal to ventral, the medulla oblongata contains the following nuclei: Raphe nuclei. The numerous raphe nuclei belong to the reticular formation of the medulla oblongata.
Which structure extends into the medulla oblongata?
Spinal Cord
2 Spinal Cord. Spinal cord is a long, thin, tubular bundle of nervous tissue and support cells that extends from the medulla oblongata in the brainstem to the lumbar region of the vertebral column. The brain and spinal cord together make up the CNS.
What are the borders of medulla oblongata?
The medulla oblongata sits between the pons and the spinal cord. Its ventral (anterior) surface faces the basilar part of occipital bone and the dens of axis (C2), separated from them by the meninges and ligaments of the atlanto-occipital and atlantoaxial joints.
Which actions are controlled by medulla oblongata?
The medulla oblongata directly controls heartbeat, blood pressure, breathing and digestion. It is located in the hindbrain, anterior to the cerebellum. It is a cone-shaped and contains the cardiac, respiratory, vomiting and vasomotor centers.
What are the function of medulla oblongata in biology?
Medulla Oblongata Function Primarily, the medulla is the control centre for respiratory and cardiovascular activities. It is responsible to regulate the blood pressure, heart rate, respiratory rate and other such life-sustaining activities.
What are the 3 main centers in the medulla?
Cardiovascular center – sympathetic, parasympathetic nervous system. Vasomotor center – baroreceptors. Reflex centers of vomiting, coughing, sneezing and swallowing.
What are the characteristics of the medulla oblongata?
General characteristics and position. The medulla oblongata is a funnel shaped structure that constitutes the terminal portion of the brainstem. It resides in the posterior cranial fossa, below the tentorium cerebelli.
What are the white matter tracts of the medulla oblongata?
The white matter of the medulla oblongata is composed of two types of tracts: Sensory tracts: cuneate fascicle, gracile fascicle, medial lemniscus, spinal tract of the trigeminal nerve, spinothalamic tract, spinocerebellar tract, spinothalamic tract, inferior cerebellar peduncle
How is the medulla oblongata drained?
Venous drainage: The medulla oblongata is drained by veins that open into the spinal veins and neighboring venous sinuses. 15. Functions: 1.
What is a medulla oblongata tumor?
One example of tumors of the medulla oblongata is a medulloblastoma. This is a primitive neuroectodermal tumor (PNET) accounting for about 20% of paediatric brain neoplasms. Other than disrupting the integrity of the tracts and nuclei present, this is a highly metastatic tumor that fortunately responds well to radiotherapy.
