Pelvis & Hip Bone: Parts, Landmarks & Articulation | Anatomy
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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
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. 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