Described in this article is a novel device that facilitates study of the cross-sectional anatomy of the human head. In designing our device, we aimed to protect sections of the head from the destructive action of handling during anatomy laboratory while also ensuring excellent visualization of the anatomic structures. We used an electric saw to create 15-mm sections of three cadaver heads in the three traditional anatomic planes and inserted each section into a thin, perforated display box made of transparent acrylic material. The thin display boxes with head sections are kept in anatomical order in a larger transparent acrylic storage box containing formaldehyde solution, which preserves the specimens but also permits direct observation of the structures and their anatomic relationships to each other. This box-within-box design allows students to easily view sections of a head in its anatomical position as well as to examine internal structures by manipulating individual display boxes without altering the integrity of the preparations. This methodology for demonstrating cross-section anatomy allows efficient use of cadaveric material and technician time while also giving learners the best possible handling and visualization of complex anatomic structures. Our approach to teaching cross-sectional anatomy of the head can be applied to any part of human body, and the value of our device design will only increase as more complicated understandings of cross-sectional anatomy are required by advances and proliferation of imaging technology.

The extensor digitorum brevis manus muscle Dear Sir,We observed an extensor digitorum brevis manus (EDBM) muscle as a fusiform prominence on the dorsal aspect of the left hand when dissecting an embalmed Brazilian adult female cadaver. It originated from the distal end of the radius; its belly lay between the third and fourth metacarpal bones, and it sent a slender tendon to insert into the ulnar aspect of the proximal phalanx of the middle finger through the broad aponeurosis of the extensor digitorum communis muscle (Fig 1). Its length was 8.2 cm, with a 1.0 cm proximal tendon and a 2.0 cm distal tendon.The EDBM is an uncommon anomalous extensor muscle of the dorsum of the hand. The EDBM muscle is present in around 2% of cases and occurs on the right and left side equally. There is no difference between genders (