The Flexors of the Thigh are the Psoas, Iliacus, and Pectineus.
The Psoas or Lumbaris is situated inwardly in the Abdomen, on the side of the Vertebra's. It proceeds from the transverse Apophyses of the two lower Vertebra's of the Back, and of the upper of the Loins, and lying on the inner Face of the Os Ilion, sticks to the lesser Trochanter or Rotator.
The Iliacus Internus hath its Origine in all the Lips of the inner Cavity of the Os Ilion, and being joyn'd by a Tendon to the Lumbaris, is inserted with it in the lesser Trochanter.
The Pectineus takes its rise from the fore-part of the Os Pubis, and is united before to the Thigh-Bone a little below the lesser Trochanter.
The Extensors of the Thigh are the Glutæus Major, Medius, and Minimus.
The Glutæus Major springs forth out of the lateral part of the Os Sacrum, as also the hinder and outer part of the Os Ilion and Coccyx, and enters into the Thigh-Bone, four Fingers breadth below the great Trochanter or Rotator, being the thickest of all the Muscles of the Body.
The Glutæus Medius, deducing its Original from the hinder and outward part of the Os Ilion, is inserted three Fingers breadth below the great Trochanter.
The Glutæus Minimus ariseth from the bottom of the Cavity of the Os Ilion, and is fasten'd to a small Hole near the great Trochanter.
The Adductors of the Thigh are the Triceps Superior, Medius, and Inferior.