Question 1

Q: Name the center shown as $X$ in the cut section of medulla which is responsible for control of respiration.

Pre-Botzinger Complex. ***Pre-Botzinger Complex*** - The **pre-Bötzinger complex** in the medulla is crucial for generating the **respiratory rhythm** and is the primary site of inspiratory rhythmogenesis. - It is located ventral to the nucleus ambiguus and contains **pacemaker neurons** that fire spontaneously. *Pneumotaxic centre* - The **pneumotaxic center** is located in the **pons**, specifically the upper pons, and primarily regulates respiratory rate and depth. - It works by sending inhibitory signals to the inspiratory center, thereby **limiting inspiration**. *Nucleus Para-brachialis* - The **nucleus parabrachialis** is located in the pons and includes the pneumotaxic center, affecting the **transition between inspiration and expiration**. - It helps in fine-tuning respiratory patterns rather than initiating the basic rhythm. *Dorsal group of respiratory neurons* - The **dorsal respiratory group (DRG)**, located in the medulla, primarily controls **inspiration** and receives sensory input from chemoreceptors and mechanoreceptors. - While it initiates the basic inspiratory muscle activity, the pre-Bötzinger complex is considered the rhythm generator. *Ventral group of respiratory neurons* - The **ventral respiratory group (VRG)**, located in the ventrolateral medulla, contains neurons responsible for both **inspiration and expiration**. - The pre-Bötzinger complex is actually part of the VRG and serves as the **rhythm-generating center** within this larger group.

Question

Name the center shown as $X$ in the cut section of medulla which is responsible for control of respiration.

Accepted Answer

Pre-Botzinger Complex

Answer

Pneumotaxic centre

Answer

Nucleus Para-brachialis

Answer

Dorsal group of respiratory neurons

Answer

Ventral group of respiratory neurons

Neuroanatomy — MCQs

Neuroanatomy — MCQs

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