Browsing by Author "Rodríguez Baeza, Alfonso"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- ItemInnervation patterns of hamstring muscles, including morphological descriptions and clinical implication(2024) Farfán Cabello, Emilio Erasmo; Rojas, Santiago; Olive-Vilas, Ramón; Rodríguez Baeza, AlfonsoPurpose: The hamstrings muscles are innervated by sciatic nerve branches. However, previous studies assessing which and how many branches innervate each muscle have yielded discrepant results. This study investigated the innervation patterns of hamstrings. Materials and methods: Thirty-five cadaver limbs were investigated. The average age of subjects was 78.6 ± 17.2 years, with 48.6% male and 51.4% female, while 57.1% were right limbs and 42.9% left. The sciatic nerve, hamstrings and associated structures were dissected. The number of nerve branches for each muscle and the level where they penetrated the muscle were recorded. Results: The sciatic nerve was connected by a fibrous band to the long head of the biceps femoris. This muscle was innervated by either one or two branches, which penetrated the muscle into its superior or middle third. The short head of the biceps femoris was innervated by a single nerve that usually penetrated its middle third, but sometimes inferiorly or, less commonly, superiorly. The semitendinosus was always innervated by two branches, the superior branch penetrating its upper third, the inferior mostly the middle third. The semimembranosus usually was innervated by a single nerve branch that penetrated the muscle at its middle or lower third. Four specimens revealed common nerves that innervated than one muscle. Conclusions: We have characterized hamstring innervation patterns, knowledge that is relevant to neurolysis, surgery of the thigh, and other procedures. Moreover, a mechanical connection between the sciatic nerve and biceps femoris long head was identified that could explain certain neuralgias.
- ItemMorphological study on the origin of the semitendinosus muscle in the long head of biceps femoris(2021) Farfán C., Emilio; Rojas, Santiago; Olivé Vilas, Ramon; Rodríguez Baeza, AlfonsoHamstring muscle injuries are the most prevalent among athletes who engage in sprinting activities. Their most frequent location is where the long head of the biceps femoris joins with the semitendinosus muscle to form the conjoint hamstring tendon. Just distal to this area, an additional group of fibers of the semitendinosus originate from medial aspect of biceps femoris. The objective of this study was to analyze the morphological characteristics of this union and to discuss its potential role in hamstring tears. Anatomical dissection was performed on 35 thighs. Samples obtained from this region were sectioned and stained with Masson's trichrome for further histological evaluation. A group of fibers from the semitendinosus muscle originating from the long head of the biceps femoris were observed in all 35 specimens. This origin was located 67 +/- 12 mm from the ischial tuberosity and was 32 +/- 14 mm in length. This group of muscle fibers had a width of 10.9 +/- 5.3 mm and a thickness in the anteroposterior axis of 3.2 +/- 1.4 mm. Its pennation angle was 9.2 +/- 1.5 degrees. Microscopic examination showed muscle cells from both muscles contacting interposed tendinous tissue. In conclusion, fibers of the semitendinosus muscle consistently arise from the proximal aspect of the long head of biceps femoris. The morphological characteristics of this junction have functional implications. The horizontal component of the semitendinosus vector could pull the long head of the biceps femoris medially during its shortening-lengthening cycle, rendering it an intrinsic risk factor for hamstring injuries.
- ItemVascularized humeral periosteal flap to treat lateral humeral condyle nonunion : An anatomical study and report of two successfully-treated pediatric cases(2019) Barrera Ochoa, S. Sergi; Soldado, Francisco; Rodríguez Baeza, Alfonso; Díaz Gallardo, Paula; Hodgson, Felipe