Lateral view of testis, tunica vaginalis incised longitudinally to expose cavity.

Head is extended at the atlanto-occipital joint and neck is flexed. A small towel is placed beneath the head for difficult cases. Laryngoscope is then entered into the oral cavity.

Interior of right shoulder joint exposed from posterior aspect.

Schematic of a child's airway, showing nasal cavity, oropharynx and laryngopharynx.

Head of femur blood supply. C. Anterior view.

Cross-section of hair follicle and sebaceous gland of the skin showing an inflamed pustule, a pimple; follicle is blocked, sebum has filled and expanded follicle cavity.

Sagittal section. A. Section through lateral aspect of intercondylar notch of femur.

Anterior view of the right shoulder joint (coronal section).

Cavities of head