fossa (anatomy) fossa (anatomy) in anatomy a fossa (/ˈfɒsə/; plural fossae (/ˈfɒsiː/ or /ˈfɒsaɪ/); from latin fossa, "ditch" or "trench") is a depression or hollow usually in a bone, such as the hypophyseal fossa (the depression in the sphenoid bone). some examples include: fossadetailsidentifierslatinfossata98a02.0.00.034fma45791anatomical terminology in the skull: cranial fossa anterior cranial fossa middle cranial fossa interpeduncular fossa posterior cranial fossa hypophyseal fossa temporal bone fossa mandibular fossa jugular fossa infratemporal fossa pterygopalatine fossa pterygoid fossa lacrimal fossa fossa for lacrimal gland fossa for lacrimal sac mandibular fossa scaphoid fossa jugular fossa condyloid fossa rhomboid fossa in the mandible: retromolar fossa in the torso: fossa ovalis (heart) infraclavicular fossa pyriform fossa substernal fossa iliac fossa ovarian fossa paravesical fossa coccygeal fossa fossa navicularis navicular fossa of male urethra fossa of vestibule of vagina ischioanal fossa in the upper limb: supraclavicular fossa radial fossa on the scapula: glenoid fossa supraspinous fossa infraspinous fossa subscapular fossa cubital fossa (a.k.a. antecubital fossa) olecranon fossa in the lower limb: fossa ovalis (thigh) trochanteric fossa acetabular fossa popliteal fossa intercondyloid fossa anterior intercondyloid fossa posterior intercondyloid fossa intercondylar fossa of femur