CorpusHuman Anatomy
RespiratoryBrain region

Brainstem respiratory centres

Also known as: respiratory centre, dorsal respiratory group, ventral respiratory group, pre-Bötzinger complex, pneumotaxic centre, apneustic centre, pontine respiratory group, control of breathing

Networks of neurons in the medulla and pons that generate the automatic rhythm of breathing and adjust its rate and depth in response to chemical, mechanical and higher-centre inputs.

Show on body map

Overview

Medulla oblongata. The dorsal respiratory group (DRG), in the nucleus of the solitary tract, contains mainly inspiratory neurons and is the main integration site for afferents from peripheral chemoreceptors and lung receptors (CN IX, X); it projects to phrenic and intercostal motor neurons. The ventral respiratory group (VRG) is a longitudinal column containing the pre-Bötzinger complex — the pacemaker-like kernel that generates the inspiratory rhythm — and neurons (nucleus ambiguus, nucleus retroambiguus) that drive forced expiration and inspiration, the pharynx and larynx.

Pons. The pontine respiratory group (formerly the "pneumotaxic centre", parabrachial/Kölliker–Fuse nuclei in the upper pons) switches off inspiration, shortening it and increasing rate; the "apneustic centre" in the lower pons promotes prolonged inspiration and is normally inhibited by pontine and vagal inputs.

Inputs. Central and peripheral chemoreceptors (the dominant drive: PaCO2/pH), pulmonary stretch, irritant and J receptors (vagus), muscle and joint proprioceptors (exercise), hypothalamus (temperature, emotion), limbic system and the cortex, which can override automatic control (speech, breath-holding) through corticospinal pathways — though rising PaCO2 eventually forces a breath (breaking point).

Location

Medulla oblongata (DRG, VRG) and pons (pontine respiratory group).

Parts & subdivisions

  1. Dorsal respiratory group
    Nucleus of the solitary tract; inspiratory, integrative.
  2. Ventral respiratory group & pre-Bötzinger complex
    Rhythm generator; inspiratory and expiratory premotor neurons.
  3. Pontine respiratory group
    Limits inspiration; fine-tunes rate and pattern.

Function

  • Generate the automatic breathing rhythm (≈12–20/min).
  • Adjust ventilation to metabolic demand and acid–base status.
  • Coordinate breathing with swallowing, speech, coughing and vomiting.

Clinical significance

Opioid-induced respiratory depression

μ-opioid receptors on pre-Bötzinger and related neurons slow respiratory rate and blunt CO2 responsiveness, leading to hypercapnia and apnoea; reversed by naloxone. Benzodiazepines and alcohol potentiate it.

Abnormal breathing patterns

Cheyne–Stokes (crescendo–decrescendo with apnoeas) in heart failure and bilateral hemispheric lesions; central neurogenic hyperventilation (midbrain/upper pons); apneustic breathing (pontine lesions); ataxic (Biot) breathing (medullary damage — ominous); Kussmaul breathing (deep, rapid) as compensation for metabolic acidosis.

Congenital central hypoventilation syndrome

"Ondine's curse" — PHOX2B mutations impair automatic control, so patients hypoventilate during sleep while voluntary breathing is preserved; they require nocturnal ventilation.

Compiled from standard anatomy and physiology references — see the Respiratory System sources. For education only; not medical advice.