| LABYRINTH | Complex structure of the inner ear comprising an osseous, or bony, part and a membranous part (9) |
| BONE | Word for an osseous organ that, paired with "idle", means lazy through to such a skeletal part (4) |
| VOCALCORD | A membranous fold in the larynx (5,4) |
| SEPTAL | Of a membranous sort |
| COGNITION | The symbolic, or top-down, approach in AI research seeks to replicate intelligence by analyzing _________ independent of the biological structure of the brain, in terms of the processing of symbols (9 |
| ANATOMIST | A new believer in atomic theory, or of the structure of the body (9) |
| TECTONICS | What is the study of the processes affecting the structure of the Earth's crust? (9) |
| FABRICATE | The whole of a complex structure (9) |
| GEARSHIFT | Auto part, and a clue to what's going on in five rows of this puzzle |
| MACROCOSM | Two males snaring a reptile with huge complex structure (9) |
| COSMOLOGY | Science of the structure of the universe (9) |
| HYPERTEXT | System that is the underlying concept defining the structure of the World Wide Web |
| BREAKDOWN | Divide into parts ... and a hint to this puzzle's theme |
| ENTABLATURE | In classical architecture, the part of a building between the capital and the roof, comprising an architrave, frieze and cornice (11) |
| COSMICWEB | Structure of the observable universe |
| UTRICLE | Larger of two fluid-filled sacs forming part of the labyrinth of the inner ear, the other being the saccule (7) |
| INTROIT | Initial chant of the Proper of the mass, usually comprising an antiphon with one verse and the gloria Patri (7) |
| SCUTE | Thickened horny or bony exoskeletal plate, as on the shell of a turtle, the skin of a crocodile etc. (5) |
| COCHLEA | Spiral cavity of the inner ear in which the sensory organ of hearing, the organ of Corti, is located (7) |
| RADIOLOGIST | A doctor specialising in the use of X-rays and methods of imaging the internal structure of the body (11) |
