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Content: 00:00 Introduction & Content 00:34 What is the Pelvis? 04:23 Hip Bone 04:32 Ilium 09:18 Pubis 10:52 Ischium 12:19 Pelvic Articulations 14:00 Outro & Next Topic 🫀Help me make more free educational content: / @taimtalksmed 📲Other Links: Website: https://taimtalksmed.com/ Instagram: / taimtalksmed Discord: / discord This video is about the pelvis and hip bone. What is the Pelvis? The pelvis is the ring-like bony structure connecting the spine to the lower limbs. Consists of the right hip bone, left hip bone, and sacrum. These form the bony pelvis, which is divided into: Greater pelvis (false pelvis) – Located above the pelvic brim; supports abdominal organs. Lesser pelvis (true pelvis) – Located below the brim; contains pelvic and urogenital organs. The pelvic inlet is marked by the linea terminalis Diameters: Transverse diameter – Widest horizontal span, ~13 cm. Oblique diameter – From sacroiliac joint to iliopectineal eminence, ~13.5 cm. Anatomical conjugate – From sacral promontory to pubic symphysis, ~11–12 cm. Hip Bone Anatomy Ilium (Os ilium) Iliac crest (Crista iliaca) – Palpable ridge; muscle attachment site. Anterior superior iliac spine (Spina iliaca anterior superior) – Sartorius, inguinal ligament attachment. Anterior inferior iliac spine (Spina iliaca anterior inferior) – Rectus femoris origin; iliofemoral ligament. Posterior superior iliac spine (Spina iliaca posterior superior) – Posterior attachment for ligaments and fascia. Posterior inferior iliac spine (Spina iliaca posterior inferior) – Landmark at posterior ilium border. Iliac tubercle (Tuberculum iliacum) Iliac fossa (Fossa iliaca) – Origin of iliacus muscle. Arcuate line (Linea arcuata) – Internal ridge, part of pelvic brim. Iliac tuberosity (Tuberositas iliaca) – Roughened area for sacroiliac ligament. Auricular surface (Facies auricularis) – Articulates with sacrum at sacroiliac joint. Gluteal surface (Facies glutea) – Outer surface for gluteal muscle origin. Posterior gluteal line (Linea glutea posterior) – Between gluteus maximus and medius origin zones. Anterior gluteal line (Linea glutea anterior) – Separates medius and minimus origins. Inferior gluteal line (Linea glutea inferior) – Marks lower origin of gluteus minimus. Supra-acetabular groove (Sulcus supraacetabularis) – Origin of reflected head of rectus femoris. Ischium (Os ischii) Ischial tuberosity (Tuber ischiadicum) – Origin for hamstrings and ligament attachments. Ischial spine (Spina ischiadica) – Landmark between sciatic notches. Greater sciatic notch (Incisura ischiadica major) – Becomes foramen via sacrospinous ligament. Lesser sciatic notch (Incisura ischiadica minor) – Converted to foramen by sacrotuberous ligament. Body of ischium (Corpus ossis ischii) – Forms lower part of acetabulum. Ramus of ischium (Ramus ossis ischii) – Fuses with inferior pubic ramus; supports obturator foramen. Pubis (Os pubis) Pubic tubercle (Tuberculum pubicum) – Inguinal and superior pubic ligament attachment. Pubic crest (Crista pubica) – Rectus abdominis and pyramidalis origin. Symphysial surface (Facies symphysialis) – Forms pubic symphysis with opposite pubis. Pecten pubis (Pecten ossis pubis) – Pectineus muscle origin, part of pelvic brim. Obturator crest (Crista obturatoria) – Defines obturator canal path. Superior pubic ramus (Ramus superior ossis pubis) – Forms upper part of obturator foramen. Inferior pubic ramus (Ramus inferior ossis pubis) – Fuses with ischial ramus. Acetabulum Acetabular margin (Margo acetabuli) – Rim of the socket. Acetabular notch (Incisura acetabuli) – Incomplete area bridged by ligament. Lunate surface (Facies lunata) – Articular surface for femoral head. Acetabular fossa (Fossa acetabuli) – Non-articular central depression. Articulations & Ligaments Sacroiliac joint (Articulatio sacroiliaca) – Between sacrum and ilium; strong ligamentous support. Pubic symphysis (Symphysis pubica) – Fibrocartilaginous joint at midline. Posterior sacroiliac ligament (Lig. sacroiliacum posterius) – Stabilizes posterior SI joint. Anterior sacroiliac ligament (Lig. sacroiliacum anterius) – Supports anterior capsule. Interosseous sacroiliac ligament (Lig. sacroiliacum interosseum) Sacrotuberous ligament (Lig. sacrotuberale) – Converts sciatic notch to foramen. Sacrospinous ligament (Lig. sacrospinale) Superior pubic ligament (Lig. pubicum superius) Inferior pubic ligament (Lig. pubicum inferius) Obturator membrane (Membrana obturatoria) Sources: • Kozlowski, T. (2017). Memorix Anatomy, 2nd ed. • Standring, S. (2020). Gray’s Anatomy, 42nd edition • Tubbs RS, Shoja MM, Loukas M. (2016). Bergman’s Encyclopedia of Human Anatomic Variation • White TD, Folkens PA. (2005). The Human Bone Manual Programs used: Complete Anatomy, Biorender, PowerPoint