1. One of two autonomic nerve plexuses in each lung
   - pulmonary plexis

Type of: nerve plexus

• family Anomalopidae
• family Anomiidae
• family Antedonidae
• family Antennariidae
• family Anthocerotaceae
• family Antilocapridae
• family Aphididae
• family Aphyllanthaceae
• family Apiaceae
• family Apidae
• family Aplodontiidae
• family Aplysiidae
• family Apocynaceae
• family Apodidae
• family Apogonidae
• family Apterygidae
• family Aquifoliaceae
• family Araceae
• family Araliaceae
• family Araucariaceae
• family Arcellidae
• family Arcidae
• family Arctiidae
• family Ardeidae
• family Arecaceae