TotalSeg Abdominal Muscles (Dataset952) — 23-class CT segmentation (T4-L4 anatomical)

TotalSegmentator v2 abdominal_muscles submodel. 22 fg classes covering T4-L4 anatomical chest+abdomen muscles: pectoralis_major / rectus_abdominis / serratus_anterior / latissimus_dorsi / trapezius / external_oblique / internal_oblique / erector_spinae / transversospinalis / psoas_major / quadratus_lumborum (each L+R). Apache-2.0 weights. Patch [176,112,112] @ [1.0, 0.75, 0.75] mm anisotropic, L=5 PlainConvUNet, cubic B-spline resample, NibabelIOWithReorient, CTNormalization. Critical for cardio sarcopenia battery: pectoralis_major (T4 PMA per McDonald 2014) + erector_spinae (T8/T12 ESM per Nemec 2017). Coverage: T4-L4 only (model auto-clips).