Basic Anatomy

Clues in this puzzle

Across

• Digit frequently stubbed in dark bedrooms (3)
• Joint that reflexively jerks when struck beneath the cap (4)
• Three pounds of soft tissue contemplating its own existence (5)
• Audacity, or an electrochemical wire bundle firing impulses (5)
• Spongy bellows swapping carbon dioxide for oxygen (4)
• Gristle cushion lining joints and shaping ears and noses (9)
• Peristaltic chute shuttling swallowed boluses downward (9)
• Lineage carrier composed of plasma, disks, and platelets (5)
• Nudge joint home to a so-called funny bone (5)
• Weaponize an upper appendicular branch (3)
• Acid vat churning chime behind a muscular lining (7)
• Slender calf splint riding shotgun beside the shin (6)
• Book binder forming a serpentine column of 33 segments (5)

Down

• Cob feature that contains a hammer, anvil, and stirrup (3)
• Conduit headed for the right atrium against gravity (4)
• Ancient seat of bad temper filtering out elderly erythrocytes (6)
• Ancient Roman flute serving as your sturdy shinbone (5)
• Clear front window that bends incoming photons first (6)
• Dry white frame manufactured in marrow-filled struts (4)
• Fibrous stabilizing strap mooring one skeleton piece to another (8)
• Schoolchild expanding in the shadows and shrinking in the sun (5)
• Tough collagenous tether joining meat to mineral (6)
• Endocrine cluster brewing both insulin and digestive enzymes (8)
• Talk endlessly with a hinged mandible or maxilla (3)
• Saucy backtalk formed of orbicularis oris tissue (3)
• Chewy stick that serves as gingival anchoring for incisors (3)
• Trendy socket for the head of the femur (3)

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