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A–Z Index

I

All anatomy entries starting with "I"

27 entries
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27 entries  ·  Muscles
Muscle Iliacus musculus iliacus Pelvis & Hip The iliacus is the flat triangular muscle that fills the iliac fossa, joining the psoas major… Muscle Iliacus (Full) musculus iliacus Pelvis & Hip The iliacus originates from the entire iliac fossa and joins the psoas major to form the… Muscle Iliocostalis musculus iliocostalis Spine The iliocostalis is the most lateral column of the erector spinae group, spanning the full length… Muscle Iliocostalis (Full) musculus iliocostalis (pars erectoris spinae) Lower Back The iliocostalis is the most lateral column of the erector spinae, running from the iliac crest… Muscle Iliocostalis Cervicis musculus iliocostalis cervicis Neck The cervical portion of the iliocostalis is the most superior part of the lateral erector spinae… Muscle Iliocostalis Lumborum musculus iliocostalis lumborum Lower Back The iliocostalis lumborum is the lumbar portion of the iliocostalis, forming the most lateral column of… Muscle Iliocostalis Thoracis musculus iliocostalis thoracis Spine The thoracic iliocostalis runs rib-to-rib in the thoracic region, extending and stabilising the thoracic spine while… Muscle Iliopsoas musculus iliopsoas Pelvis & Hip The iliopsoas combines the iliacus from the iliac fossa and the psoas major from the lumbar… Muscle Iliopsoas musculus iliopsoas Pelvis & Hip The iliopsoas is technically two muscles, the psoas major descending from the lumbar spine and the… Muscle Inferior Oblique (Eye) musculus obliquus inferior oculi Head & Skull The inferior oblique is one of the six extra-ocular muscles, the only one not arising from… Muscle Inferior Pharyngeal Constrictor musculus constrictor pharyngis inferior Head & Skull The inferior pharyngeal constrictor has two functionally distinct parts. The thyropharyngeus constricts the hypopharynx during swallowing.… Muscle Inferior Rectus (Eye) musculus rectus inferior oculi Head & Skull The inferior rectus depresses the abducted eye and is associated with the lower eyelid retractors, explaining… Muscle Infraspinatus musculus infraspinatus Shoulder The infraspinatus occupies most of the infraspinous fossa below the scapular spine and is the primary… Muscle Intercostal Muscles (External) musculi intercostales externi Chest The external intercostal muscles occupy the posterior and lateral intercostal spaces, with fibres running inferomedially analogous… Muscle Intercostales Externi musculi intercostales externi Chest The external intercostal muscles fill the intercostal spaces from the vertebral column to the costochondral junctions… Muscle Intercostales Interni musculi intercostales interni Chest The internal intercostal muscles run opposite to the external intercostals, with fibres directed downward and backward… Muscle Internal Intercostals musculi intercostales interni Chest The internal intercostal muscles run perpendicular to the external intercostals (superoanteriorly rather than inferoanteriorly), depressing the… Muscle Internal Oblique musculus obliquus internus abdominis Abdomen The internal oblique has fibres running roughly perpendicular to the external oblique, with most fibres directed… Muscle Internal Oblique (Full) musculus obliquus internus abdominis Abdomen The internal oblique lies deep to the external oblique with fibres running at 90 degrees to… Muscle Interossei (Foot) musculi interossei pedis Foot & Ankle The foot has four dorsal and three plantar interossei muscles analogous to those in the hand,… Muscle Interosseous Dorsalis I (First) musculus interosseus dorsalis primus manus Hand & Wrist The first dorsal interosseous is the most prominent and easily tested interosseous muscle, forming the rounded… Muscle Interosseus (Foot) Dorsal musculi interossei dorsales pedis Foot & Ankle The four dorsal interossei of the foot abduct the second, third, and fourth toes away from… Muscle Interspinales (Lumbar) musculi interspinales lumborum Lower Back The lumbar interspinales are paired small muscles flanking the interspinous ligament between adjacent spinous processes. They… Muscle Intertransversarii musculi intertransversarii Spine The intertransversarii connect adjacent transverse processes throughout the cervical and lumbar spine, acting as intersegmental lateral…
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