Cross-section of a synovial joint to show the progression of osteoarthritis (in four stages).

Cross-section of a synovial joint to show the progression of osteoarthritis: stage 2.

Cross-section of small synovial joint showing progression of disease of rheumatoid arthritis: step 1.

Cross-section of small synovial joint showing progression of disease of rheumatoid arthritis: step 4.

Cross-section of gravid uterus showing variations in position of placenta.

Cross-section of small synovial joint showing progression of disease of rheumatoid arthritis: step 2.

Cross-section of placenta to reveal the circulatory anatomy; proximal end of umbilical cord is seen at top.

Technique for intramuscular injection in children, dorsogluteal site; illustration shows cross-section of pelvic region at injection site indicating location of desired muscle (maximus, medium, minimus gluteal mm. ).

Transverse section through thigh at level of hip joint. B. Magnetic resonance image (MRI). (Numbers refer to structures in A. ) Insert image indicates level of MRI.

Femoral sheath. B. Transverse section through femoral vessels and nerve. Note that the psoas major tendon separates the femoral artery from the hip joint. Insert image indiates level of dissection.

Close up view of cross section of upper vagina and cervix with wooden or plastic spatula pressed against cervix, longer end introduced slightly into os. Arrow indicates rotation to obtain ectocervical sample.

Four examples of placental placement within uterus, shown as cross-sections (top) and schematically from below (bottom). Normal placenta (far left), low implantation (left), partial placenta previa (right), total placenta previa (far right).

Hip joint, cross section